Tap chi Khoa hgc Tnr&ng Dai hgc Cdn Tha Phdn B: Nong nghiip, Thuy san vd Cong nghe Sinh hgc: 26 (2013): 12-18
Tap chi Khoa hoc Tru'dng £)ai hoc Can Thd website: sj.ctu.edu.vn
A N H HU'dNG CUA K H O I LlTONG T R I T N G V A CHI S O H I N H D A N G L E N TI L E A P N d V A T H O N G SO TRUTSG G A T A U V A N G
Do Vd Anh Khoa'
' Khoa Nong nghiep vd Sinh hoc Ung dy.ng, Trudng Dgi hoc Cdn Tha Thong tin chung:
Ngdy nhgn. 01/10/2012 Ngdy chdp nhdn: 20/06/2013 Title:
Effects of weight and shape index on the hatcheiy percentage and egg parameters in Tau Vang lexers
Tukhoa:
Gd Tdu Vdng, khoi luong trung. chi so hinh ddng, chi sd trung vd ti le dp na Keywords:
Tau Vang layer, egg weight, shape index, egg parameters, hatcheiy percentage
ABSTRACT
Raising backyard chicken is one of the traditional animal production models in the Mekong Delta. In recent years, chicken of Tau Vang breed is added to the conservation program ofthe indigenous breeds due to it own great characteristics for performance and meat quality traits. This current is to study effects of egg M'eighl and shape index on hatchery percentage and indexes of egg in Tau Vang layers. In general, it was found effects of (i) weight on shape index and on loss of water after incubation and fertilized percentage (p<0.05) (ii) shape index on loss of M'ater after incubation and on unfertilized percentage (p<0.05).
Additionally, the study also demonstrated that measured egg indexes and weight of egg was gradually increasing according to aging progress in the period 24-32 weeks of age m Tdu Vdng layers.
TOM TAT
Chdn nuoi gd thd vuan td mgt trong nhiing nghe chdn nuoi truyen thong cda nguai ddn dong bdng sdng Cuu Long. Gdn day giong gd Tdu Vdng d khu vice phia Nam dang duoc chu y vd dua vdo danh sdch bdo ton b&i nhOng uu diem cua nd ve ndng sudt vd chdt luang thit. Nghien cicu ndy nhdm tim hieu dnh hu&ng ciia khoi luang triing vd chi sd hinh ddng lin ti le dp nd vd cdc chi so do ve trimg ciia gd Tdu Vdng Nhin chung, (i) CO su dnh huang ciia khoi lugng triing len chi so hinh ddng tning, klid ndng mdt nudc sau khi dp vd ti li triing cd phoi (p<0,05), (ii) chi sd hinh ddng co dnh hudng den khd ndng mdt mrdc sau khi dp vd ti le chet phoi (p<0,05). Them vdo do, nghien ciiu ciing da tim thdy cdc chi sd do ve trimg vd khoi lucmg trimg tdng ddn theo tuoi de trong giai dogn 24- 32 tudn tuoi cua gd Tdu Vdng.
1 D ^ T V A N D E
Ddng bdng sdng Cuu Long cd mat do dan cu ddng due, tiem lyc kinh te kha cao so vdi cac viing khac, cdng them tap quan dn uong sii dung thjt, tning nhieu... la nhimg lgi thi lam cho khu vyc nay trd thanh tfaj trudng tieu thu ldn nhat nudc. Sy thudn Igi vl thien nhien, khi hau. ddt dai da lam cho nganh chdn nudi nai
day cd rat nfaieu tiem ndng phat trien, dac biet la cfadn nudi ga theo phuang thiic tha vudn.
So vdi ga cdng nghiep, ga tfad vudn rat d l nudi, cd siic chdng chiu benh cao, cd khd nang tan dyng thiic dn, chat lugng thit tham ngon, dau tu chudng trai thdp (Dd Vo Anh Khoa 2012b). Trong nhiing nam gan day, san pham ga cdng nghidp thudng bdt dn ve gia do anfa faudng cua nen kinfa te todn cau, nhung san
Tap chi Khoa bgc Tnr&ng Dgi hgc Cdn Tbrr Plidn B: Nong ngliiip. Thuy san vd Cong ngh? Smh hoc: 26 (2013) 12-18 pham ga tfaa vudn vdn dugc ngudi tieu diing
ua chugng dii gia thanfa cao.
Mdt sd gidng ga tha vudn dugc nfaieu ndng hg lua chgn Id ga Ri. gd Luang Phugng, gd Ta, ga Noi. ga Tam Hoang,... ndi bat Id ga Tau Vang vdi uu diim la thiefa ngfai tdt vdi dieu kien mdi trudng sinh thai ddng bang sdng Ciru Long, ga rdt nfaanfa nhen, kfad ndng tu tim kiem mdi trong vudn tdt, mdu sdc va cfaat lugng thit hgp thi failu ngudi tieu dimg (Dd Vo Anh Khoa, 2012a), phu hgp vdi nhieu lua tudi lao ddng ndng nhdn. Hien nay, gidng gd Tau Vang van dugc nudi trong nfaieu hg dan nhd hoat dgng bao tdn quy gen va nhd vdo nhirng ddc diem quy bdu cua gidng ga nay. Tuy nhien, van cdn it cdng trinh nghien ciiu ve ga Tau Vang ddc biet trong ITnh vyc sdn xuat va nhdn gidng. Vi vay, nghien ciiu nay se tap trung khao sat va danfa gid sy anh hudng ciia khoi lugng trimg, chi sd hinh dang len ti le ap nd ciia tning va chat lugng tning cua ga Tdu Vang.
2 P H l / O N G PHAP NGHIEN ClTU Ga Tau Vang ciia dan ga bd me d tuan tuoi thii 24-32 dugc nudi tai Trai Chdn nudi thuc nghiem Hda An (cu). Ga dugc chia dan, mdi dan gdm 5 mai va 1 trdng, nudi nhdt tren nen trau cd dien tich 3 m". Cd tdng cgng 18 dan gd tham gia vao tfai ngfaiem nay. Trong tfadi gian thf ngfaiem, ga dugc cfao dn thuc an hon hgp Player Complete 1242 ciia Cdng ty Cd phan GreenFeed Viet Nam.
Triing dugc thu thdp d cdc tudn tudi 24, 25, 26 va 32. loai bd nhiing tning kfadng dat (tning be, niit. meo md. mdng, qua nhd, di dang), danh dau va dua vdo may dp ban ty ddng (dao tning bang tay, nhiet dd-am do va thdng thoang ty hieu chinfa). Tfadi gian dp Id 21 ngdy.
Nfaiet dg va dm do trong giai doan dp I-I8 Bang 1: Anh hirdng cua khdi lining chi so hinh dang
ngay la 37,5*'C va 60-65% va trong giai doan sau do la 36,5°C va 75-80%. Tning dugc thu gom den cudi tudn roi mdi dem dp. Moi dgt dp khoang 80 tning.
Cfai tieu tfaeo ddi gdm ti le trung cd phdi (%), ti le tning khong phdi (%), ti le tning chit phdi (%), ti le nd (%), ti le trimg sat (%) (Duong Thanh Liem, 2003), chi sd ldng dd, chi sd long trang, chi so hinh ddng, ti le long dd (%), ti le long trdng (%), dan vi Haugfa, do day vd tning (Nguyen Thi Hong Loan, 2011), mau long dd (dugc do bang quat so mau).
Sd lieu pfadn ticfa duoc cfaia theo (i) 4 nhdm khdi lugng: 31,00-39,99g, 40,00-45,00g, 45,0I-49,99g va 50,01-69,65g, (ii) 4 nhdm chi sd hinfa dang: 52-70%, 71-74%, 75-80% va 81- 94%, (iii) 4 tudn tudi: 24, 25, 26 va 32 tudn tudi. Sd lieu dugc xir ly theo md fainfa GLM vd Cfai-square ciia pfadn mem MiniTab ver. 13.2.
3 K E T QUA THAO LUAN
3.1 Anh hirdng ciia khoi lugng trirng len chi sd hinh dang cua triing
Ket qua ngfaien ciru cfao tfady cd sy khac biet cd y nghTa thdng ke ve dudng kinh ddi va dudng kinh ngan giira cac nfadm ining (p=0,000). Khdi lugng tning cang ldn tfai cdc dudng cang tang. Dieu nay cho thay kfadi lugng tning ti le thudn vdi dudng kinh ddi va dudng kinh ngan. Dieu nay cd lien quan den cfai sd hinh dang (CSHD) ciia qud tning.
Trimg cd khdi lugng 31,00-39,99g se cd CSHD cao nhat va thdp nhat la trimg cd khdi lugng 45,01 -49,99g. Trong kfai CSHD giiia cac nhdm tning 40,00^5,00g va 50,01-69,65g la tuang duong nhau. Sy khdc biet cd y nghta thdng ve CSHD giiia cac nhdm trimg cd kfadi lugng khac nfaau cung dugc tim thay (p=0,000).
ciia trtrng Nhom KL (£)
31.00-39,99 40,00.45,00 4 5 , 0 M 9 , 9 9 50,01-69,65 P
Dir&ng kinh dai (cm) 4,98''±0,02 5,16'±0,01 5,36''±0,01 5,53'±0.02 0.000
DircTDg kinh ngan (cm) 3.75'±0,01 3,S6'±0,01 3,97'+0,01 4,12'±0,01 0,000
Chi so hinh d a n g (%) 75.54'±0.30 74,87"±0,13 74,18'+0,15 74,57*10.31 0,000 Cdc sdlieu a ciaig mgl cgl CO it nhdl mgl liy hieu a b.c.d^6ng nhau thi sai khac nhau khdng CO ynghia Ihdng ke(p>0.05)
Tap chi Khoa hgc Tru&ng Dgi hoc Cdn Tha Phdn B: Nong nghiep. Thuy san vd Cong nghi Sinb hgc. 26 (2013): 12-18 3.2 Anh hudng khfii lugng len sy mat nudc
cua trung cac thdi diem ap
Qua phan tich cho thdy cd sy khac biet cd y nghia v l kha nang mat nudc giu'a cac loai tning cd khdi lugng kfadc nfaau d cac tfadi diem
soi tning 6, 12 vd 18 ngay sau kfai dp (p^COOO). Tning cd khdi lugng ldn nhat (50,0I-69,65g) se cd kha nang mdt nudc nhilu nfadt. Kfadng cd sy kfaac biet v l khd nang mat nudc giira hai nhdm tning 40-45 va 45.01- 49,99 qua cac thdi diim soi trung.
Bang 2: Anh huong cua khoi lumig len su mat nu^c cua trung qua cac thoi diem ap
Nhom khoi lirong (g) MN6(g) MN12 (8) MN18(a)
31,00-39,99 40,00-45,00 45,01-49,99 50,01-69,65
1,65'±0,05 l,51*+0,02 1,52'±0,02 2,01"±0,05
l,31'+0,05 1,26'±0,02 l,45''+0,02 1,69"±0,05
1,58''±0,05 0,99'±0,02 1,06'±0,02 1,85"±0,05
0.000 0.000 0.000
Cdc so liqu a ciing moi cot co il nhdl mot ky hieu a. b, c giong nhau ihi sai khdc nhau khong CO y nghTa Ihong ke (p>0.05}. MS6, MN12 vd M\18 so g nudc mdi lai cdc Ihdi diem 6. 12 vd IS ngdy sau khi dp
Khi tning dira vao ap sir mat nirdc diln ra nhanh hem do trong may ap co nhiet do cao han moi tnrang ben ngoai nen ham Iugng nirac trong tning boc hai nhanh va nhi8u, dong thai ph6i phat trien nen can dudng chat va cac qua trinh trao doi chat trong tning diln ra nen trpng lugng tning giam nhanh. Neu trong qua trinh ap tning mat nhieu nuac hoac it nuac se lam x§u di cac dilu kien song ciia phoi (Biii Hiiu Doan, 2009).
Theo Bui Huu Doan (2009). thi cho rjng nhCing tning lan thi binh quan dien tich v6/l dan vi Ichdi lugng thdp han la tning nho. Su boc hoi nuac tu triing qua cac lo khi phu thuoc vao dien tich b l mat vo tning. Trung nho se mSt nhieu nuac han triing lon trong ciing dieu
thay nhiing trimg co khoi lugng Ion thi su mat nuac nhieu nhat, ke den la nhirng triing cd khoi lugng nhd va nhirng tning cd khdi lugng trung binh thi su mat nudc thap nhat.
3.3 Anh hwdng ciia khoi lu'ang triing len ti le a p nff
Nhtrng tning cd khdi lugng td' 40,00-69,65g (95,04-96,21%) cd ti le tning cd phdi cao han nhuTig tning cd khdi iugng 31,00-39,99 (88,76%). Su khac biet nay cd y nghTa thong ke {p=0,001). Khong cd su khac biet giua cac nhdm triing 40,00-45,00g, 45,01-49,99g va 50,01-69,65g. Ti le trung co phoi chiu anh hudng ciia nhieu yeu to nhu tudi ga trdng, giong, dinh duang,... (Dao Dire Long va TrJn Long, 1993).
kien ve dp am. Nhung kel qua thi nghiem cho
Bang 3: Anh huvng ciia khdi lirong trlrag l€n ti le trlrng co phoi va ti 16 trirog khong phoi Nhom KL (g)
31,00-39,99 40,00-45,00 45,01-49,99 50.01-69.65
So trimg CO phoi 150/169 843/887 685/712 154/162
TLCP (%) So trirng khong phoi TLKP (%) 8,76'
95,04' 96,21' 95.06"
19/169 44/887 27/712 8/162
11,24' 4,96'' 3,79' 4,94'
0,001 0,001
Cdc so lieu a ciing moi col cd il nhdl mdi k\' hieu a, b giSng nhau ihi sai khdc nhau khong cd y nghta Ihdng ke (p>0,05).
TLCP lile Ining cd phdi. TLKP: II le trung khdng phdi
Bang 4: Anh hirong ciia kh6i lirong tning len H le chit phoi, ti le nff/tlng trimg co phoi v4 ti le ming sat Nh6mKL(g) So tning chil phoi TLCHP(%) So trirng no TLN;CP(%) Si trlrag s^l TLS (%) 31.00-39.99 38/150 2533 io27i50 MM 1^50 667 40.00-45.00 184/843 21,83 571/843 67,73 88/843 10*44 45.01-49.99 146/685 21,31 475/685 69,34 64/685 9*34 50,01-69.65 33/154 21,43 101/154 65.58 20/154 1299
0,575 0.575
TLCHP: It le trung ch4t phdi. TL\ CP ll le nd/tdng Inmg co phdi TLS It le trirng sdi
0,575
169 887 712 162
102 571 475 101
60,36 64,37 66,71 62.35
67 316 237 61
39,64 35,63 33,29 37,65 Tgp chi Kboa hgc Tnr&ng Dgi hgc Cdn Tha Pban B: Nong nghiep, Thuy san vd Cong ngh? Sinh bgc: 26 (2013): 12-18 Tuang img vdi cac nhdm kfaoi lugng 31,00- sy pfadt trien se ngimg lai va phdi hi chet, khi 39,99g, 40,00-45,00g, 45,0I-49,99g va 50,01- soi tning se thdy vit dinh den vao vd (Dao 69,65g tfai ti le tning cfait phdi lan lugt la Due Long, 1993) hay nhiet do faodc dm do cua 25,33%, 21,83%, 21,31%, 21,43%. Khdng cd tii dp qua cao hay qua th§p cung anh hudng su khac biet c6 y nghTa v l ti le tning chet pfadi den ti le nd (Smitfa, 1993). Kit qua ngfaien ciiu giiia cac nfadm khdi lugng tning. Mdt sd tac cung cho thay ti le nd/tdng tning cd phdi. ti le gia ngy y rang, cd nfaieu yeu td ddn den cfaet nd/tdng tning ap va ti le tning sat giiia cac phdi, i.e. trong nfaiing ngay dp dau tien neu nhdm khdi lugng khdng cd khac biet thdng ke.
khdng dao tning phdi se bi long dd ep vao vd.
Bang 5: Anh htrdng cua khoi lirang len ti le nfr/tdng tnrng dp va ti le trirng khdng nfr
Nhom khoi Iwyng (g) Tdng Nd TLN (%) Khong nfr TLKN (%) 31,00-39,99
40,00-45,00 45,01-49,99 50,01-69.65
P 0377 0,377 TLN li le trirng na. TLKN ti IS Irdng khdng na
3.4 Anh hudng ciia chi so hinh dang len nhau cd y nghTa. Theo do khdi lugng qua cac khoi lugng trirng qua cac thdi diem ip thdi diem sau khi dp 6, 12 va 18 ngay ciing Khdi luong tning tmdc khi j p giOa cac l^iSngcd su khac biptcd ynghia thdng ke giiia nhdm chi s6 hinh dang khac nhau khong kliac '^^'^ " ' ' ° ' " ' ™ ' 8 co ch. so hmh dang khac nhau.
Bang 6: Anh hirfrng cua chi sd hinh ddng len khoi lirgng ciia trung qua cac thfri diem ap
Nhdm CSHD (%) KL(g) KL6(g) KL12 (g) KL18(g) 52-70 45,12+0,42 43,22+0,41 41,72+0,41 40,04±0,41 71-74 44,81±0,42 43,07±0,4I 41,65+0,41 40,14+0,41 75-80 44,79+0,42 42,88+0,41 4I,46±0,41 39,69±0,41 81-94 44,78+0.42 43,02±0,41 41,69±0,4I 4Q.OI±0,41 P 0,927 0,953 0,969 0,881 KL- khdi tugng ban ddu., KL6. KL12 vd KLIS: khSi lugng qua cdc ih&i diim 6, 12 vd 18 ngdy sau khi dp
3.5 Anh hudng cua chi s6 hinh dang len su dugc tim thay {p=0,095). Su khac biet ro dugc m^t nirdc qua cac thdi diim ap tim thay d miic y nghTa thdng ke d thdi diem _, . :.^ , ... . , . , L~.. - 18 ngay sau khi ap (p=0,017) nai ma nhdm Theo ket qua ngfaien cuu, su kfaac biet gan _ , ^ , . . ^ . . v j . it -,A - I L • -
, , , A , r 1 , , i . , - i - i . trung CO cfal so fainh dang 71-74 co kha nang CO y ngfaia tfaong ke ve kfaoi luang nuoc da mat ^ , , ^ , x ,, ,r. , n ^^s
•'.^ , : ... . , . \ r i u- V .. matnuacthapnhat(l,51±0,06).
sau 6 ngay ap giua cac nfaom chi so hinh dang ^ , Bang 7: Anh hudng ciia s6 hinh ddng len sir mat nirfrc ciia triing qua cdc thoi diem dp
Nhom CSHD (%) MN6 (g) MN12 (g) MN18 (g)
52-70 1,90+0,06 1,50+0,06 I,69''±0,06 71-74 1,74+0,06 1,42±0,06 1,51 '''+0.06
75-80 1,91+0,06 1,42+0,06 1,77'±0,06 81-94 1.75+0.06 1,33+0,06 l,68'+0.06 _p 0,095 0,312 0,017
Cdc s6 lieu a ciing mot cgl nhdl mgl ky hieu a, b gidng nhau thi sai khdc nhau khong coy nghTa ihdng ki (p>0.05).
.\1N6. .\lN12va-MyT8 sd g nir&c mdi tgi cdc ih&i diem 6. 12 va 18 ngay sau khi dp
nudc mdt di khdng dang ke, tir nhung ngay co the va trong trao ddi chdt (Biii Diic Liing va sau cho din khi gan nd phdi sii dung nhilu Nguyen Xuan Son, 2003). Sy hao hut khdi nudc trong long trdng de xdy dyng cac td chirc lugng nudc trong thdi gian dp phu thudc vao
Tgp chi Khoa hgc Tnr&ng Dgi hoc Cdn Tha PhdnB: Ndng nghiep. Thiiy san vd Cong nghe Sinh hgc-26(2013) 12-18 tinh cfadt cua vd va kich thudc be mat ciia
tning (Bui Quang Toan, I98I). Mgt qua tning khdng dugc thu tinh tfai lugng riudc mdt di tu trirng xdy ra tuang ddi diu tir ddu tdi cudi dgt dp. Tning cd phdi ti le mdt nudc ve cudi qua trinh dp tang len. Kfai bdt ddu dp, nudc mat di tir tning chi dan thudn theo tinh chdt ly hgc tiic la phu thugc vao nhiet do, dm do va tdc do gid d trong may dp. Khi phdi da ldn han va cac mang ciia phdi bdt ddu hoat ddng thi cdng ngdy sy mdt nudc cang mang tinfa chdt sinfa ly nghia la phu thudc vao tfal trang va cudng do trao ddi cfaat ciia phdi (Biii Hiru Doan, 2009).
3.6 Anh hudng ciia chi s6 hinh dang Ien ti l | ap nd
Trong nghien cuu nay, ti le tning cd phdi dugc ghi nhan ldn lugt la 95,04%, 95,05%, 95.20% va 91.51%. tucmg iing vdi nfadm chi so hinh dang 52-70%, 71-74%, 75-80% vd 81- 94%. Su chenh l?ch v l ti le tning cd pfaoi giira cac nhdm chi sd hinh dang kfadng tfaong ke (p=0,435). Ket qua nay cao faan vdi tfadng tin ciia La Thi Thu Minh (2000) rang ti le tning cd phdi binh quan d ga dat khoang 80%.
Bdng 8: Anh hirfrng ciia chi so hinh dang ISn ti l€
trung c6 phdi vd ti le trirng khong phoi cua trirng ga Tau Vang
Nh6m CSHD (%)
52-70 71-74 75-80 81-94 P
T6ng Co 242 687 895 106
. . . TLCP f*"' (%)
230 95.04 653 95.05 852 95J0 97 91,51 0.435
Khong phoi 12 34 43 9
TLKP
(%)
4,96 4,95 4,80 8,49 0,435 TLCP ll li iri'rng cd phdi. TLKP: li te trirng khong phdiBang 9: Anb hirfrng ciia chi so hinh dang len ty le sdt ciia trung gd Tau Vang
Them vao dd, ti le tning chit phdi, ti le nd/tong tning cd phdi va ti le tning sat cua tning ga Tau Vang tir tudn tudi 27-38 cua cac nghiera thuc ciing dugc ghi nfaan (Bang 9). Cd sy kfaac biet cd y ngfaia v l ti 1? trimg cfaet phdi, ti le triing nd/tdng triing cd phdi va ti 16 tning sat giua cac nfadm chi sd hmh ddng c6 sy khac biet (p=0,007). Ti le tning cd phoi cao nhat ndm d nfadm cfai sd hinh dang 71-74 (25,11%) va thdp nhat la nhom chi sd hinh dang 81-94 (21,65%). Sy kfaac biet khdng cd y nghTa thong ke v l ti le tning chit phdi, ti le tning nd/tdng tning cd phoi va ti le tning sat dugc tim thay giua cac nfadm cfai sd hinh dang cdn lai 52-70, 75-80% va 81-94%.
Theo Vd Ba Thg (1996), tning tdt la nhihig trirng cd chl sd hinh dang tir 65-75%. Neu ldn han 75% la ngdn va nhd han 65% la dai. Hinfa dang cua qud tning giir vai trd dang ke ddi vdi ti le dp nd vi nd lien quan den vi tri nam cOa phdi. Theo kit qua thi nghiem tfai nhihig tning cd chi sd hinh dang 71-74% cd ti 1^ dp nd/tdn§
tning cd phdi tot nhdt. Nhiing tning cd chi sd hinh dang 52-70% cd ti Ie nd/tdng tning cd pfadi tfadp la do bi mat nudc nfaieu va bj sat nhieu trong qua trinh ap nd (do mat nudc nhieu nen ga khd khay md khi nd) va ket qua nay cung phii hgp vdi nghien ciiu cua Vd Ba Thg (1996).
Ket qua nghien ciiu cung da chi ra khdng cd sy khac biet cd y ngfaTa ve ti 1$ nd/tong tning ap va ti le tning khdng nd cua tning ga Tau Vang qua cac tudn tuoi nghien ciru, mac du nhdm chi sd hinh dang 71-74 cd ti Ie nd cao nhat (66,23%) va ti le khdng nd thdp nhat (33,77%) (Bang 10).
chet phoi, ti le nfr/tong trirng co phdi va ti 1$ triiiig Nh6m CSHD (%)
52-70 71-74 75-80 81-94 P
Tong 230 653 852 97
Chet phoi 57 164 190 21
TLCHP (%) 24,78' 25,11' 22,30' 21,65*
0,007 N*
143 455 584 67
TLN/CP (%) 62,17' 69.68' 68.54' 69.07'' 0,007
Sat TLTS(%) 30 13,04"
34 5,21' 78 9,15"
9 9,28'' 0.007 Cdc so lieu a cung mdi cgl co il nhdl mgl k}' hieu a. b gidng nhau thi sai khdc nhau khong coy nghTa Ihdng ki (p>0.05) TLCHP n I? trung chil phdi. TLN CP: li le no/ldng trung cd phdi. TLS ti li trung sdt
Tap chi Khoa hgc Tnr&ng Dgi hoc Cdn Tha Phdn B Ndng nghiep, Thuy san va Cong nghe Sinh hoc. 26 (2013f: 12-18 Bang 10: Anh hudng ciia chi s6 hinh dang len ti l£ nfr/tdng triing ap vd ti le trirng khong nfr cua tnrng
gd Tau Vdng Nhom CSHD (%) 52-70 71-74 75-80 81-94 P
TSng 242 687 895 106
Nff 143 455 584 67
TLN (%) 59,09 66,23 65,25 63,21 0,235
Khong No"
99 232 311 39
TLTKN (%) 40,91 33.77 34.75 36,79 0,235 TLN: li If trung na. TLKN: li le trung khdng nd
3.7 Anh hirdng ciia tuan tuoi len cac thong sd triing
Ket qua ghi nhdn ve cac sd do cua tning qua cac tuan tudi 24, 25, 26 va 32 dugc thi hien qua Bdng 11.
Nhin chung, khdi lugng tning vd cac dudng kinfa d cac tuan tudi cd su khac biet cd y nghTa vl mat thong k.e(p<0,05). Cac chi sd do nay tdng dan tfaeo tudn tudi. Tuy nfaien, khdng cd su kfadc biet cd y ngfaTa ve chi sd hinh dang cua tning qua cac tuan.
Ciing vdi sy tang ve kfadi lugng va cfaieu do cua tning, cac cfai sd do ve khoi lugng Idng trdng Cling tang theo mdn tudi mgt each cd y nghTa tfadng ke {p=0,003). Sy khac biet cd y nghTa thdng ke ve dudng kinh trung binfa Idng Bang 11: Anh hudng ciia cac tudn tuoi thi nghiim
trang cung dugc gfai nfaan qua cac tudn tudi khao sat {p=0,002). Chi sd nay la tuang ducmg nhau giira tuan 24 va 26 hodc giua tudn 25 va 32. Su tang dan tfaeo tudi ve cfaiiu cao ldng trdng (p=0,072) va sy kfadc nhau ve chi sd ldng trang (p=0,084) ciing dugc ghi nhan gdn cd y ngfaTa tfadng ke. Nguyen Thi Mai et al.
(2009) cfao rdng chi sd Idng trang tning phu tfaudc vdo loai, gidng, cac ca the.
Ciing theo khuynfa hudng v l sy tang cua mgt sd chi sd do theo tudi nhu dd phdn tich, cac chi sd do v l Idng do nhu khdi lugng (p=0.000), dudng kinh trung binfa {p=O,600) va cfaiiu cao {p=0,054) ldng dd cung tang theo tudn tuoi va sy tang nay cd khac biet ve mat y nghia tfadng ke.
len cac thong so trung itieu
•-
KL.g DKl, cm DK2. cm CSHD KLLT, g DKTBLT, cm CCLT, cm TLLT. % CSLT KLLD, g DKTBLB, cm CCLD, cm TLLD. % CSLD KLV.g DDV. mm MLS Haugh
24 35,89'±1,03 4,86'±0,72 3,56'±0,04 73,52±1,20 21,57''±0,79 7,82'±0,17 0.36=0,03 59,91±0,91 0,05=0,01 10,79'±0,39 3,80'±0,06 1,23=0,05 30,14±0,90 0,33±0,02 3,53'±0,14 0.34=0,01 7,52'±0,36 67.10±2.28
Tuan tuoi 25 38,19''=1,06 4,96''±0,73 3,73''±0.05 75,60±1,23 22.55'±0,81 S,16''±0,17 0,39±0.03 58,92±0,28 0,05±0.01 1I,78''±40 3.82'±0,06 1.28±0.06 31,06±0,92 0,34±0.02 3,85'±0,15 0,34±0.01 6,40''±0,37 66,77±2.23
26 40,15'±1,03 5,01**0,72 3,78*±0,04 75,52±1,20 23,09'±79 7,88'±0,17 0,46±0,03 57,29±0,91 0,06±0,01 12,45'±0,39 3,92'±0,06 1.39±0.05 31,17±0,90 0.35±0,02 4,61 "±0,14 0.32±0,01 8,10**0,3 73.98±2,28
32 47,36'=1,50 5,3r±0,10 3,98"±0,06 75,00±1,75 26,92"±1,15 8,92*±0,24 0,47±0,05 56,79tl,32 0.05±0,01 I5,30"*0,56 4,30'±0,0S 1,46±0,08 32,35±1,30 0,34±0,02 5,14"±0,20 0,32±0,01 8,70*±0,53 71,34±3,30
P 0,000 0,008 0,000 0,579 0,003 0,002 0,072 0,122 O.084 0,000 0.000 0,054 0,568 0,624 0,000 0,312 0,002 0,094 Cdc sd lieu a ciing mdt hdng co il nhr^ mgt ky hieu a b.c gidng nhau ihi sai khdc nhau khdng cdy nghfa thong ke (p>0.05) KL. khdi lugng, DKl. ducmg kinh dai, DK2- duang kinh ngdn, CSHD- chi sd hinh ddng, KLLT khoi luang long trdng. DKTBLT du&n^ kinh trung binh long trdng. CCLT: chieu cao Idng trdng. TLLT li 14 long Irdng. CSLT chi sd long trdng, KLLD khdi luong long do. DKTBLD- du&ng kinh trung binh tdng do, CCLD- chiiu cao long do, TLLD' ti le long do. CSLD chi so long dd. KLV khdi lirgng vo trirng. DDV: do ddy volrimg. hfLD Mduldngdo
17
Tilp chi Khoa ligc Tni&ng Dgi hgc Cdn Tha Phdn B: .Kdng nghiep. Thuy san vd Cong nghi Smh hgc: 26 i2013/ 12-18 Khdi lugng \ d tning cung tdng tfaeo tuan
tudi. Sy khdc biet nay rat cd y nghia thdng ke (p=0,000). Trong khi do mdu cua long dd dugc tim thdy sam nhat (p<0,05) va dan vj Haugfa dugc tim tha\ cao nhat (p=0,094) vao cdc tudn tudi 26 va 32.
4 KET LUAN
Ket qua nghien ctru anfa faudng cua kfadi lugn^ vd chi sd hinfa dang len ti le dp nd va cdc cfai sd tning cfao tfady (1) dudng kinfa ngdn vd dudng kinfa dai ti le thuan vdi kfadi lugng tning. (ii) nfadm trung 31.00-39,99g cd chi sd hinfa dang cao nhat. (iii) nfadm tning 50,01- 69.65g cd kha ndng mdt nudc nfaieu nhat trong qua trinh dp, (iv) ti le tning cd pfadi cao dugc tim thay trong nhdm tning trung binh va Idn 40-69.65g, (v) cfai sd hinh dang khdng dnh hudng den khd ndng mat nudc tai cac thdi diem 6 va 12 ngay sau kfai dp, ti le tning cd phdi, ti Ie tning nd. Tuy nhien. nhdm tning cd chi sd hinh dang 52-70 cho kha ndng mdt nudc nhieu nhat va ti Ie tning sat cao nhat, trong khi ti le chet phdi cao nfaat dugc tim tfady d nhdm tning cd chi sd hinh dang 71-74, (vi) trong giai doan 24-32 tuan tudi. khdi Iugng va mdt so chi sd do v l tning (dudng kinh trung binh ldng trdng va ldng dd. khdi lugng vd tning, mau long dd) tdng dan theo tudi.
LCH CAM TA
Nghien ciiu nhan dugc sy ho trg cua Sd Khoa hgc vd Cdng nghe tinh Hdu Giang va Cdng ty Cd phan GreenFeed Viet Nam.
TAI LIEU THAM KHAO
1. Bui Diic Lung, Nguyin Xudn San (1999). Ap trung gia cdm bang phuang phdp thu cong vd cong nghiep. NXB Nong nghiep Ha Ngi.
2. Biii Diic Liing, Nguyin Xuan San (2003). Sinh ly sinh sdn vd dp tning gia cdm bdng mdy cong nghiep. NXB Nong nghidp.
3. Bill HihJ Doan (2009). Tning vd dp tning gia cdm. Trudng Dai hoc Nong nghiep Ha Npi.
4. Biii Quang Toan (1981). Sd tay chdn nuoi gia cdm. NXB Ndng nghiep.
5. Dao Diic Long, Tidn Long (1993). Ap tning gd vd urn gd con. NXB Nong nghiep Ha Npi.
6. La Thj Thu Minh (2000). Gido trinh chdn nuoi gia cdm. Trudng Dai hoc Can Tha.
7. Dd Vo Anh Khoa (2012). Bgc diim sinh trudng vd hiiu qud sir difng thuc dn cda gd Tdu Vdng. Tap chi Nong nghiep va Phat triln Nong thon 16: 30-36.
8. D6V6 Anh Khoa (2012). Chdt lugng thit gd Tdu Vdng. Tap chi Nong nghiep va Phat triln Ndng thdn 21; 45-50
9. Duong Thanh Liem (2003). Bdi gidng chdn nuoi gia cdm. Dai hoc Ndng ldm TPHCM.
10. Nguyen Thi H6ng Loan (2011). Ddnh gid dnh hicdng ciia tuoi len thdnh phdn hoa hgc vd chdt lugng tning gd ha Brown vd trung gd Tdu Vdng. LVTN Dai hoc nganh Chan nudi Tfaii y.
Trudng Dai hoc Cdn Tha.
11. Nguyen Thi Mai, Biii Huu Doan, Hoang Thanh (2009;. Gido trinh chan nuoi gia cdm.
NXB Ndng nghiep Ha Npi.
12. Vo Ba Thp (1996). Ky thugt nudi gd cong nghiep. NXB Ndng nghiep.
13. Smith, A.J. (1993). Poultry'. The Uopical agriculturalist
