Tap chi Khoa hpc va Phat tri6n 2010: Tap 8, sd 2: 263 - 268 T R U ' 6 N G DAI HOC NONG NGHIEP HA NQI
SUT DUNG THAN LA U CHUA LAM THUfC AN NUOI BO THjT TAI BAG GIANG
Using Ensilaged G r o u n d n u t H a u l m as Feed for Beef Cattle in B a c G i a n g Province Mai Thj Thom, Nguyen Xuan Trach, Nguyen Thi Tii
Khoa Chan nudi & NTTS, Tru&ng Dgi hgc Ndng nghiep Hd Ngi Dja chi email tac gia lien lac: [email protected]
TOM T A T
Thi nghiem du'p'c t i l n hanh tai 6 nong hp cua huyen Hiep Hoa, tinh Bic Giang d l danh gia hieu qua cua viec su' dung khiu phin an cho bo thjt co than la lac ii chua khong bp sung bpt ngo, b6 sung 3% va 6% bpt ngo. 12 be dire Laisind tCr 18 - 21 thang tu6i du'O'c chia lam 3 16, mdi Id 4 con, trong khiu phin an co than la lac u chua vai 3 cong thii'c: 0,5% mu6i (CT1); 0,5% mu6i va 3% bpt ngo (CT2);
0,5% mudi vai 6% bpt ngo (CT3). Sau 90 ngay nuoi, tang trpng hang ngay cua bo thi nghiem dat 0,49;
0,52 va 0,55 kg/con/ngay, tu'ang ipng vai CTl, CT2 va CT3. Tang trpng cua bo cho an than la lac ii chua vai 0,5% mu6l va 6% bpt ngo dat cao nhit 0,55kg/con/ngay va t h i p nhit la bo an than la lac u chua khong bo sung bpt ngo. Nhu' vay, nuoi bo vai khiu phin co than la lac u chua vai 0,5% mudi va 6% bdt ngd cho tang trpng va hieu qua kinh t l dat cao nhit (103,19 nghin ddng/con/thang).
Tip khoa: B I C Giang, bo thjt, than la mia, u chua.
SUMMARY
An experiment was conducted to investigate the effects of partly replacement of corn meal (0% ; 3% and 6% corn meal) with ensilaged groundnut haulm in diet of crossbred (Red Sinhi x local Yellow) young bulls in Hiep Hoa district, Bac Giang province. Twelve young bulls, aging 18 - 21 months old, were allotted in three treatments, each of four animals. After of 90 days of feeding, the average daily gain (ADG) of cattle fed three levels of 0; 3 and 6% corn meal were 0.49; 0.52 and 0.55 kg/head/day, respectively. In conclusion feeding ensilaged groundnut haulm with 0.5% of salt plus 6% corn meal in cattle diets had the highest of average daily gain (0.55 kg/head/day) and profitable( 103,19 thousant VND per head per month).
Key words: Bac Giang, cattle, ensilage, groundnut haulm.
1. DAT VAN D E 0,23 de'n 0,46% than la lac li ehua vdi 0,5%
Dien tieh gieo trdng eay lac hang nam mud'i ya 5% bdt s i n (cam) tinh theo khd'i lupng toan qud'e dat 0,24 trieu ha/nam, khd'i lUdng cd the trong khau p h i n nudi bd giup tang thu phu pham than la lac sau thu hoach Udc dat nhap tii 112.800 ddng de'n 119.100 0,46 trieu tan chat khd/nam (BCii Van Chinh ddng/con/thang (Dd Thi Thanh Van va cs., va cs., 2002). Than la lac sau khi thu hoach 2009). Hau het cae nghien eUu va sii dung cu v i n cdn xanh va giau chat dinh dUdng. than la lac trong chan nudi da dupe thi^e Theo Nguyin HCfu Tao (1996), than la lae hien tai mdt so' dia phUdng, nhUng Ble sau khi thu hoach chiia 26,45% VCK, 14,17% Giang la tinh trong nhieu lae d mien Ble lai protein thd, 28,99% xd thd. Bd sQa an khau chUa dUde nghien ciiu. Hdn niia, eae tac gia phan cd than la lac ii ehua, chie'm 39% nang ^eu nghien cctu tren mpt cdng thiie u chua va lUdng toan khau phan, van cho nang suat cho bd an vdi ty le khae nhau. (J day, nghien sUa eao (Nguyin Hiiu Tao, 1996). Sii dung tii eiiu nay tie'n h a n h u ehua than la lae vdi ba 263
Su' dung than la u chua lam thiJc an nuoi bo thit tai B§c Giang cdng thUc khae nhau nham tim dupe edng
thiic u ehua t h a n la lae thich hdp va su dung ed hieu qua ngudn phu pham nay lam thiie an cho trau bd tai tinh Bac Giang.
2. PHUONG PHAP NGHIEN
CUXJ Thi nghiem dUde tie'n hanh trong cac ndng hd chan nudi bd thit tai Hiep Hoa, Bac Giang tii thang 8 de'n thang 11 nam 2009.Bd thi nghiem dUde nudi trong 6 hd gia dinh, mdi hd nudi 2 con bd lai Sind dUde chpn dong deu ve khd'i lupng, dp tud'i. Bd thi nghiem dupe nudi trong d ehudng, mdi d ehudng nudi 2 eon va ehia lam 3 Id, mdi Id 4 con an theo k h i u p h i n dupe xay diing theo tieu ehuan cua Kearl (1982). TrUdc khi tie'n hanh thi nghiem, bd dUdc tay ki sinh trung va lam quen vdi khau p h i n thi nghiem. Thdi gian theo ddi thi nghiem la 90 ngay, khdng ke 15 ngay dau lam quen thUe an. Bd dUde eho an than la lac ii chua, thUe an tinh va rdm 3 l l n trong ngay (sang, trUa va td'i), ed tU nhien
dUdc eho an 2 lan trong ngay (sang, trUa). bd dupc ud'ng nude tu do.
Lupng thUe an thu n h a n dupc xac dinh thdng qua can thUc an cho an va thUc an thUa hang ngay ciia tiing ca the. Ta't ca bd thi nghiem dupe can vao buoi sang trUde khi eho an, vao thdi diem trUde khi thi nghiem, 2 t u l n can 1 lan va khi ke't thiic thi nghiem b i n g can dien tii Rud weight eiia Uc. M l u t h a n la lac ii chua va m l u thiic an ciia bd dupe phan tich tai Phdng phan tich thiic an, Khoa Chan nudi va Nudi trdng thiiy san, TrUdng Dai hpc Ndng nghiep Ha Ndi. Danh gia hieu qua kinh te dupe tie'n h a n h tren cd sd so sanh thay doi thu — chi eiia cac Id thi nghiem vdi ddn gia dUde lay ed' dinh tai thdi diem thi nghiem. So sanh ve tieu ton thiic an va tang trpng giiia cac Id thi nghiem thiic hien qua phan tich phUdng sai 1 nhan to'.
Can cii vao ngudn nguyen lieu san cd tai dia phUdng, nghien ciiu nay tie'n hanh phd'i trdn thUe an tinh hdn hdp gom 4 nguyen lieu:
bdt sin, cam gao, bpt ngd, bpt dd tUdng va ure.
B a n g 1. T h a n h p h a n h o a h o c ciia c a c l o a i thiJfc a n c h i n h t r o n g t h i n g h i e m
ThLPC an Co ty nhien Rffm lua Than la lac u chua
cn
CT2 CT3
VCK 20,45 89,23
26,42 27,20 28,14
Protein thp 12,64
5,05
12,67 12,14 11,57
Thanh phin NDF 56,37 80,12
51,43 50,34 49,12
hoa hpc ADF 28,64 52,71
31,61 30,66 29,72
Khoang 12,83 14,08
13,34 12,91 12,12 CTl: Than Id lac u chua khdng bd sung bdt ngd* 0.5% NaCI
CT2: Tlian Id lac u chua bd sung 3% bot ngd + 0,5% NaCI CT3: Ttlidn Id Igc u chua bd sung 6% bpt ngd -^ 0.5% NaCI
B a n g 2. C o n g thvfc thiJc a n t i n h h 6 n ho'p
Nguyen lipu Trong kg thipc an tinh
Bpt san (g) Cam g$o (g) Bpt ngp (g) Bpt 30 tu'ang (g) Ure (g) VCK (g) Protein tho (g) ME (Meal)
300 300 275 100 25 855,33 171,14 2,56 264
Mai Thi Thom, NguySn Xuan Trach, NguySn Thi TO
B a n g 3. S o do b o ' t r i t h i n g h i e m
~~ — . — — — ^ ' - ° "^' nghiem
Chi tieu ______^
n
Tuoi bo (thang) Kh6i lypng bo ( kg/con) Thai gian chuan bi (ngay) Thai gian thi nghi?m (ngay) Co ty nhien (kg/con/ngay) Ram kho (kg/con/ngay) Cong thycl
Cong thifc 2 Cong thyc 3
Thyc an tinh (kg/con/ngay) Khoang premix (kg/con/ngay)
L6 1 4 1 8 - 2 1 196,6 ±3,2
15 90 5 T y do
7 0 0 2 0,1
LP 2 4 1 8 - 2 1 212,7 ±4,5
15 90 5 Ty do
0 7 0 2 0,1
LP 3 4 18-21 202,5 ± 5,6
15 90 5 Tydo
0 0 7 2 0,1
B a n g 4. ThiJfc a n t h u n h a n h a n g n g a y
Chl tieu
L6 1 5,46' 1,86 0,67 1,22 1,71 2,78 0,47 10,31
LP thi nghiem LP 2 5,37"
1,85 0,59 1,22 1,71 2,53 0,45 10,03
L6 3 5,05°
1,84 0,28 1,22 1,71 2,49 0,44 9,90 VCK an vao (kg/con/ngay)
ThSn la lac u chua (kgVCK/con/ngay) Ram kho (kgVCK/con/ngay) Co ty nhien (kgVCK/con/ngay) Thyc an tinh (kgVCK/con/ngay) VCK an vao so khoi lypng (%) Protein tho (kg/con/ngay) IslLTB (Mcal/con/ngay)
Ghi chu:NhCrng gid trii trung binh trong ciing hdng khdng mang chir gidng nhau thi sai khdc cdy nghia (P<0.05)
3. KET QUA VA THAO LUAN
Thanh phan hoa hpc ciia cac loai thcte an ddng trong thi nghiem nay da dUdc phan tieh va trinh bay d bang 1. Thiic an thu nhan ciia bd d 3 cdng thiic thi nghiem la tUdng dd'i cao vi d ca 3 cdng thiic rdm dUdc cho an tu do (Bang 4). LUdng vat chat khd an vao trong khau phan dao dong tiif 5,05 den 5,46 kg/con/ngay, cao nha't d Id 1 la 5,46 kgVCK/con/ngay, tha'p nha't d Id 3 la 5,05 kg/con/ngay. Ludng VCK an vao giiia cac Id bd thi nghiem cd sU sai khac rd ret (P<0,05).
VCK an vao so vdi khd'i lUdng bd d Id 1 cao nhat 2,78%, sau dd de'n Id 2 la 2,53% va tha'p nhat Id Id 3 la 2,49%. Ke't qua nay ehiing td, khi li chua than la lac khdng bd' sung hot ngd
da lam tang ti'nh ngon mieng nen bd an dUdc nhieu rdm kho hdn. Protein va nang lUdng trong khau phan nudi bd thi nghiem cd ty le giam dan theo ty le bd' sung hot ngd, protein d 16 1 cao nha't 0,47 kg/con/ngay, cdn tha'p nha't d 16 3 la 0,44 kg/con/ngay va nang lUdng dat 10,31; 10,03 va 9,90 Meal/eon/ngay tUdng iing vdi cac 16 thi nghiem sii dung khau p h i n ed than la lac u chua khdng bd sung bpt ngd, bd' sung 3% va 6% bpt ngd. Tuy bd d Id 1 thu nhan dUdc tdng nang lUdng va protein eao hdn cac 16 khac, nhUng ngudn nang lUdng thu dUdc tii rdm nhieu hdn cae 16 khac, hdn niia lai cl dang khd tieu da lam cho hoat ddng eua vi khuan phan giai xd kem hieu qua d i n de'n tao sinh khd'i vi sinh vat tha'p. Vi vay, tang trpng cua bd d Id 1 dat thap nha't.
265
Si> dung than la u chua lam thiJc an nuoi bo thit tai Bic Giang
B a n g 5. Khoi Ixidng t i c h luy va t a n g t r o n g t u y e t doi
Chi tieu
LP thi
SP con Kh6i lyang bo (kg)
Ban dau Thang thir 1 Thang thy 2 Thang thy 3 Tang trpng (kg/con/ngay)
Thang thir 1 Thang thir 2 Thang thir 3 Trung binh
nghiem
Tieu tPn thirc an (kg VCK/kg tang trcjng)
L6 1
4
196,6 209,5 225,7 240,3
0,43°
0,54' 0,49'
0,49' 10,50'
L6 2 4
212,7 226,0 243.3 259,3
0,44' 0,58'"
0,53'"
0,52'"
9,59"
LP 3
4
202,5 217,7 235,3 251,6
0,51"
0,59"
0,54"
0,55"
8,71 =
SEM
3,67 3,89 4,02 3,84
0,02 0,02 0,03 0,02 0,35 Ghi chii: .NhCrng gid tri trung binh trong ciing mdt hdng khdng mang elm cdi gidng nhau thi sai khdc cd y nghia
thdng ke vai muc( P<0.05)
Qua bang 5 ciing cd the tha'y rang, khd'i lupng bd thi nghiem tai thdi diem b i t dau theo ddi d Id 1 la 196,6 3,2; 212,7 4,5 va 202,5 5,6 kg, giiia 3 Id khdng cd sU sai khac thd'ng ke (P>0,05).
Sau 30 ngay thi nghiem khd'i lUdng trung binh d 16 1 la 209,5, 16 2 la 226 va Id 3 dat 217,7 kg cdn khi ke't thiic thi nghiem dat eac gia tri tUdng Ung la: 240,3 kg; 259,3 kg va 251,6 kg. Ke't qua tren cho tha'y, tang trpng ciia bd dat tUdng dd'i td't. Sau mpt thang thi nghiem eho tang trpng trung binh la 0,43; 0,44 va 0,51 kg/con/ngay, tUdng iing vdi bd d Id 1, Id 2 va Id 3. O thang thii nhat, tang trpng gifla Id 1 va 16 2 co sU sai khac khdng dang ke (P>0,05), nhUng tang trpng ciia Id 3 so vdi Id 1 va 16 2 cd sU sai khae rd ret vdi miic (P<0,05). Ke't qua nay cung tUdng tu nhu ke't qua thu dUdc trUde day cua Dd Thi Thanh Van va cs. (2008), khi sii dung tif 0,23 de'n 0,46% than la lac u chua tinh theo khdi lUpng cd the trong khau phan nudi bo. Ket thuc thang thii hai, tang trpng eiia bd cao hdn thang thii nha't, 16 1 tang trpng
thap nhat 0,54 kg/con/ngay, sau dd de'n Id 2 la 0,58 kg/con/ngay va cao nhat la Id 3 0,59 kg/con/ngay. Sii sai khae ve tang trpng d Id 1 va Id 2, Id 2 va Id 3 chUa ldn (P>0,05) nhUng gifla 16 1 va 16 3 ed sU sai khac thd'ng ke (P<0,05). Ke't qua tren eho thay, khi cho bd an nhieu lan trong ngay da tao dieu kien cho he vi sinh vat hoat dpng cd hieu qua hdn, dac biet bd d 16 3 dUde an than la lae li chua cd ty le 6% bpt ng6, cho tang trpng cao nha't.
Thang thii ba tang trpng cua bd cl ta't ca cac 16 thi nghiem deu thap hdn thang thfl hai, tuy nhien tang trpng ciia bd d Id 1 va Id 2; 16 2 va 16 3 khdng ed sU sai khac ve thd'ng ke (P>0,05), chl ed tang trpng tuyet dd'i ciia bd thi nghiem d Id 3 va Id 1 la khac nhau ed y nghia thd'ng ke (P<0,05).
Sau 90 ngay thi nghiem, tang trpng trung binh cua bd thi nghiem d Id 3 dat cao nhat 0,55 kg/con/ngay, sau dd den Id 2 la 0,52 kg/con/ngay va Id 1 eho ket qua tha'p nha't la 0,49 kg/con/ngay. Tuy nhien, tang trpng trung binh ciia bd d 16 1 va Id 2; Id 2 va 15 3 khae nhau khdng nhieu (P>0,05), nhung
Mai Thj Thom, NguySn Xudn Trach, NguySn Thi Tu tang trpng trung binh eua bd d Id 1 va Id 3 ed
sU sai khae rd ret (P<0,05). Nhu vay, ket qua nghien eflu nay cho tha'y, tang trpng ciia bd thi nghiem nudi trong giai doan tfl 18 den 21 thang tud'i d Hiep Hoa, Ble Giang tfldng dfldng vdi ket qua nghien eflu vd beo bd bang phu pham ndng nghiep cua cac tac gia Vu Van Npi va cs. (1999), bd thi nghiem cho tang trpng 510 - 580 g/eon/ngay; Dd Thi Thanh Van va es. (2008), sii dung than la lae u chua cd bd' sung 5% hot san trong khau phan nudi bd thit tai Quang Tri, tang trpng ciia bd dat tfl 0,49 - 0,58 kg/con/ngay.
Nhu vay, trong qua trinh u chua than la lac ed bd' sung bdt ngd lam tang ty le sii dung dudng eiia vi sinh vat (VSV) cd trong cac cdng thfle u chua tao dieu kien thuan ldi cho VSV len men lactic phat trien, han ehe that thoat protein thd trong cdng thfle Ci ehua nen td'c dp t a n g trpng eiia bd khi sii dung than la lae ii chua cd bd' sung 3 va 6%
bpt ngo dat ke't qua to't. Ket qua nghien eflu
eiia ehiing t6i cho tha'y, bd d thang thfl 2 cho tang trpng eao nhat sau dd on dinh hoae giam khdng dang ke d thang thfl 3 va thap nhat d t h i n g dau.
S6' lieu bang 5 cung cho thay, tieu t6'n thfle an ciia bd trong thi nghiem dao dpng tfl 8,71 de'n 10,5 kg VCK/kg tang trpng, trong dd Id thi nghiem 1 tieu td'n thfle an cao nha't va tha'p nha't la Id 3. Tieu td'n thfle an gifla 3 16 thi nghiem cd sfl sai khae thd'ng ke (P<0,05). Sd' lieu tren cho thay, bd d Id 1 an dupe nhieu rdm khd hdn nen lUdng thu nhan chat khd cua bd S 16 1 cao nha't, hdn nfla khi u ehua than la lac kh6ng b6' sung bpt ngd da han ehe' sU len men lactic, lam that thoat protein thd d i n de'n td'c dp tang trpng ciia bd dat thap nha't, do vay tieu td'n thfle an eua bd d 16 1 cao nha't.
De danh gia chinh xac hdn ke't qua nu6i bd thit trong giai doan vd beo bang than la lac li chua vdi 3 cdng thfle, hieu qua kinh te dfldc tinh sd bp n h u 5 bang 6.
B a n g 6. Hieu qua k i n h te giiifa cac 16 thi n g h i e m
TT
1 2 3 4 5 6 7 8 9 10 11 12 1 II III
Chi tieu
Ram kho Co ty nhien Than la Igc Bpt ngo Mu6i Tinh hon hpp Cong cham s6c Cong u Dung cy
Premix khoang - vitamin Chi mua thudc thii y Till nilong Tong chi phi Doanh thu t.ci\ nhuan
(dPng/kg)
500 300 300 3500 1000 3000 25000 30000
100000
30000
35000 So lypng
360 1800 2520
11,7 720 30
3
5
4
174,8 L6 1
Tien (1000 d)
180 540 756
11,7 2160 750
90 30 500
20 120 5157,7
6118 96,3
s6
lypng 324 1800 2520 76 11,7 720 30
3
5
4
186,4 LP 2
Tien (1000 d)
162 540 756 266 11,7 2160 750
90 30 500
20 120 5405,7
6524 1118,3
So lyp'ng
252 1800 2520 152 11,7 720 30
3
5
4
196,4 LP 3
Ti6n (1000 d)
126 540 756 532 11,7 2160 750
90 30 500
20 120 5635,7
6874 1238,3
267
so dung than la u chua lam thiJc an nuoi bo thit tai Bac Giang Sd' lieu d bang 6 eho thay, thu nhap tii
nudi bd thit d 16 3 dat cao nha't 6.874 nghin ddng, cdn Id 1 thap nha't 6.118 nghin ddng, nhUng td'ng ehi phi d Id 3 eung cao nhat (5.635,7 dong), cdn d 16 1 chi phi thap nhat (5.157,700 ddng). NhU vay, mac du ngUdi chan nudi phai d i u tu nhieu hdn de nudi bd, hp van thu dUdc lai cao hdn nhd tien thu dfldc tfl san pham ldn hdn. Sau 90 ngay, thi nghiem thu dUdc lai tfl 80,02; 93,19 de'n 103,19 nghin dong/eon/thang, tfldng flng vdi khau p h i n ed than la lac ii chua khdng bd sung hot ngd va bd' sung 3%; 6% bpt ng6.
Nhfl vay, khi nu6i bd thit b i n g than la lac ii chua ed bd sung bpt ngd se mang lai hieu qua kinh te hdn.
4. K E T L U A N
- Su dung than la lac u chua vdi 0,5%
mud'i va 6% hot ng6 (CT3) trong khau phan eiia bd thit eho tang cao nha't (0,55 kg/con/ngay), edn tang trpng thap nhat la sii dung than la lac ii chua vdi 0,5% mud'i. Tieu td'n VCK/kg tang trpng tha'p nha't 6 16 3 va cao nhat d 16 1.
- Sii dung than la lae ii ehua vdi 0,5%
mud'i va 6% bdt ngd trong khau phan nu6i bd
thit b giai doan tfl 18 de'n 21 t h i n g tud'i eho hieu qua kinh te cao nha't (103,19 nghin ddng/con/thang) va tha'p n h a t la than l i lae li chua vdi 0,5% mud'i (80,02 nghin ddng /con/thing).
TAI L I E U T H A M K H A O
Bui Van Chinh, Le Viet Ly, Nguyen Hflu tao, Pham Van Thin, Dd Vie't Minh va Nguyen Van Hai (2002). Ke't qua nghien eflu, che' bien va sii dung phu pham ndng nghiep lam thfle an gia sue. Vien Chan nudi - 50 nam xay dflng va p h i t trie'n.
Kearl (1982). Nutrient requirements of ruminant in developing countries.
International foodstuffs Institute. Pages 82 - 87. UTAH Agricultural experiment station UTAH State university LOGAN.
Vii Van Ndi, P h a m Kim Cfldng va Dinh Van Tuyen (1999). Sii dung phu pham va nguon thfle an san cd tai dia phfldng de vd beo bd. Bao eio khoa hpe Chan nudi Thu y. Hue 28 - 38/6/1999, Tr. 25 - 29.
Nguyen HQu Tao (1996). Nghien eflu nudi dfldng bd sfla va ldn thit bang khau p h i n an ciia than la lac che bie'n, dfl trfl sau thu hoach. Luan an phd tie'n si khoa hpe ndng nghiep, Tr. 67 - 102.
Tap chi Khoa hpc va Phat triln 2010: Tap 8, s6 2: 269 - 276 TRU'ONG DAI HOC NONG NGHIEP HA NQl
KHA NANG SAN XUAT CUA CAC TO HOP LON LAI GIO'A
NAI Fi (YORKSHIRE x MONG CAI) VOTl Dl/C GIONG DUROC, LANDRACE VA Fl (LANDRACE x YORKSHIRE) NUOI TAI BAC GIANG
Reproductivity of Fi(YxMC) Sows and Meat Productivity of Dx(YxMC), Lx(YxMC) and (LxY)x(YxMC) Reared in Bac Giang Province
Vu Dinh Ton''^, Nguyen Cong Oanh^
'Khoa Chan nudi vd Nudi trdng Thiiy sdn, Tru&ng Dgi hgc Ndng nghiep Hd Ndi ''Trung tdm nghien cim lien nganh PTNT, Tru&ng Dgi hgc Ndng nghiep Hd Ngi
Dia chi email tac gia lien lac .• [email protected]
TOM TAT
Nghien ciru Sirtrc thyc hien tai 30 nong hp thupc 2 huyen miln nui (Luc Nam va Luc Ngan) tinh B I C Giang tir thang 1/2008 d i n thang 9/2009 nhim danh gla nang s u i t sinh san, nang s u i t va chit lu'P'ng thit cua mpt s6 t6 hp'p lai giiJa lp'n nai Fi(Yorkshire x Mong Cai) (Fi(Y x MC)) phpi vo'i dye Duroc (D), Landrace (L) va dye Fi(Landrace x Yorkshire) (Fi(L x Y)). K i t qua cho thIy: Lp'n nai Fi(Y x MC) khi phdi vir\ dye giong D, L va Fi(L x Y) d i u eho nang s u i t sinh san tot. Kha nang tang khdi lu'P'ng, tieu t i n thirc an, ty le nac cua hai td hp'p lp'n lai nuoi thjt DxF1(Y x MC) va L x F1(Y x MC) t i t hen to hp'p lai Fi(L x Y) x Fi(Y x MC). Chit lu'O'ng thjt xe eua ba to hp'p lai d i u binh thu'O'ng thong qua cac chi tieu cam quan. Do do eo the nhan rpng mo hinh chan nuoi lp'n nai Fi(Y x MC) p h i i vol dye gilng D va L trong diiu kien chan nuoi nong hp 6" khu vye miln nui tinh Ble Giang.
TIP khoa: Chit lu'O'ng thjt, lp'n nai Fi(Y x MC), lp'n lai nuoi thjt, sinh san, san xult thjt.
SUMMARY
A study was carried out on 30 pig farms in 2 highland dietricts (Luc Nam and Luc Ngan) of Bac Giang province from January 2008 to September 2009 in order to evaluate reproductive performance, the growth rate, eareass and meat quality of crossbreds from Fi(Yx MC) sows and Duroc, Landrace or Fi(Landraee x Yorkshire) boars. Results showed that Fi(Y x MC) sows mated with Duroc, Landrace or Fi(Landrace x Yorkshire) boars had good reproductive performances. The growth rate, FCR and lean meat percentage of two D x F1(Y x MC) and L x F1(Y x MC) crossbreds were better than Fi(L x Y) x F1(Y X MC) erosbreds. Meat quality based on sensory criteria of these three types of crossbreds was satisfactory.
Key words: Crossbreds, Fi(YxMC) sows, meat, reproduction.
1. DAT VAN DE Fi (YXMC) ph6'i due Landrace eho nang sua't sinh san, sinh trudng va thit eao (Vd Trong Hien nay, viee sU^ dung nii Fi(YXMC) Hot va cs., 1993; Nguyin'Van Thing'va lam nai nen dUde phd bien rpng rai trong Bang Vii Binh, 2004). Theo Nguyin Van chan nu6i n6ng hp, chie'm 47,27% (Vu Dinh Thing (2007), nai lai F,(YXMC) phd'i vdi dUc Ton va Vd Trong Thanh, 2005). Nhieu Pietrain cho toe dp sinh trUdng nhanh, nang nghien eflu da khing dinh to hdp lai gifla nai sua't thit va ty le nac cao d ddi con. Dang Vu
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