KHOA Hpc C O N O NOHj
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CHAIV M U O I O THIJA THl£lV HLl£
Nguyen Minh Hodn^
T6MTAT
Nhdm m u c tidu bao ^ n vd ndng cao ndng s u i t cdc gidng vdt nudi ban dia, trong dd cd gd Ri - Id mdt gidng cd nhidu d$c digm ^ t k h a nSng chdng chju vdi cdc didu ki^n nong I m , dg nudi, it b^nh tdt, c h i t lupng tiijt thom, ngon, dd tai nghidn ciiu chpn lpc vk nhdn thuin gidng ga nay da dupc tidn hanh b i ndm 2012. Dd tidn hdnh chpn lpc ttieo tidu c h u l n ngoai hinh: mdu ldng vdng rom, da vang, chdn vdng, mo vdng, mdo don trong qudn thd gd d}a phuong; kdt qud cho t h i y khodng 19,5% sd ga dat tidu c h u l n . Sau dd cho nhdn thudn vd theo ddi khd ndng sinh truong, khd ndng d e tning ciia ddn con thg h$ 1; kgt qud cho Uily: Gd Ri cd khdi lupng c a did tit khi mdi n d ddn 17 tudn tudi ddu t h i p , c p thd d 1 tudn tudi d^t 42,3 ± 1,01 g; t u 1 dgn 3 tudn tudi khdi lupng CO thg tdng chdm; t i 3 ddn 6 tuan tudi tdng nhanh hon; t u 6 ddn 9 tudn tudi tdng nhanh n h i t ; sau dd tdng khdi lupng c6 chidu h u d n g giam dan; ddn 17 tudn tudi khoi lupng c o thd gd dat 1166,3 ± 25,5 g. Khdi lupng CO thd cda ga trdng cao horn so vol ga mdi d t i t ca cdc t u i n tu6i. Tudi dd qud tning ddu tidn vdo khodng 130 ngdy vd tudi dat ty lg dd 5% trong ddn la khoang 135 ngdy, tuong iing khdi lupng c a thd gd mdi Id 1200,5 g/con vd 1206,2 g / c o n . T^ lg dd t h i p , cao n h i t Id 34,4% d t u i n tuoi thti 23 vd dn dinh ddn t u i n tudi thti 34, sau dd giam d i n . Kdt qud n g h i t o cuu cho t h i y , gd Ri d khu vuc ndy cd khd ndng sinh trudng t h i p , ^ 1$ de t h i p nhtmg thdi gian didnh thi^c tuong ddi sdm, mtic d$ bidn dOng vd cdc chi tidu nghidn ciiu khd cao. Do vdy, chiing ta d n phdi quan tdm nghidn ctiu chpn lpc vd nhdn t h u i n dd ndng cao ndng s u i t gd Ri.
Tii khda: Gd Ri, chgn lgc, Ididi lugng, de tning.
I.O^TVAVDC
Gd Ri Id mdt trong nhOng gidng gd dia phuong dupc nudi phd bidn d h l u k h ^ mpi mign dit nudc ta.
Gd Ri dd gin lign vdi truydn thdng vdn hda cua ngudi ddn ddc bigt Id mdu sic ldng. da. Gd Ri cd khd ndng chdng chiu bgnh tdt trong didu kign nhigt ddi ndng Im, dd nudi, chiu kham khd, phim chit ditt ngon.
Tuy nhidn, khd ndng sinh trudng kdm, c h ^ ldn, khdi lupng ca thd khi trudng thdnh thip, higu qud kinh tg trong chdn nuoi khdng cao. Do nhimg ddc digm trgn ndn gd Ri it dupc quan tdm trong cdc md hmh chdn nudi hdng hda.
TVong nhOng ndm gin ddy dd cd mpt sd cdng trinh chpn lpc vd nhdn gidng gd Ri. Nguydn M ^ Himg vd cdng si; (1994), Nguydn Ddng Vang vd cdng St; (1999), Ld Hdng M§n vd Nguygn Thanh Son (2001), Biu Diic Lung (2002), Nguygn Huy Dgt vd cdng si; (2004) ddu cho ring gd Ri bt pha tgp nhidu, cd nhidu logi mdu sic khde nhau, sinh trudng ch$m, khdi lupng co thd luc trudng tiidnh thip.
TUy nhidn khu vtrc midn Tnmg hdu nhu chua cd nghign cthi ndo. Dg gdp phin bdo tdn, timg budc
chpn lpc, nhdn thuin vd cdi tidn ndng suit gd Ri trong didu kign chdn nudi b midn Trung, dd tdi nghidn cihi "Dinh gii sinh trudng vi khi nSng dd trung cua gd Ri sau 1 thdh$ chon Ioc trong didu kidn chSn nudi ThUa Thidn - Hud" dd dupc tidn hdnh nhdm miic tidu:
- Ddnh gid khd ndng sinh trudng, tudi tiidnh thtic, ty lg de cua ddn gd Ri trong didu kign chdn nudi oThira Thidn-Hud.
- T g o v ^ Ugu k h d i d i u d d c h p n lpc, n h d n t h u i n n d n g c a o n d n g s u i t c u a g d Ri tgi dja p h u o n g .
Z. VAT 1<U VA PHUONG PHAP NGHfiU Cilu 2 . 1 . V$t ligu n g h i d n c i ^
G d Ri c 6 m d u s i c l d n g v d n g r o m , c h d n v d n g , d a v d n g , m o v d n g d d d u p c c h p n Ipc tiit d d n g d dja phuong.
' Tmdng Dgi hpc Ndng Ldm Hui
Sdlupng gddddn g^c 400 con
Sd lupng chpn lpc
78 con
Sdlupng theo ddi smh trudng
53 con
Sdlupng tiieo ddi dfe tning 68 con 2.2. Nfl dung n ^ t e oiru y i phuong phip tfau tfa4p9<!li^
2.2.L ChgnlacgiSi
NONG NGHIEP VA PHAT TRI^N N C N G THON - KV 2 - THANG 10/2013 77
K H O A H Q C C 6 M n ^ „ t
Ga Ri dupc chpn lpc tir quan thd ga dia phuong, gdm 400 con. Dd dupc chpn tiieo ddc didm ngoai hinh nhu sau:
- Gd trdng: Todn than mdu vang rom, d i u cdnh, chdt dudi didm nhOng ldng den, chan vang, mo vang, mao don.
- Gd mdi: Toan thdn mau vang rom, didm nhung ldng den o cd, dau cdnh va chdt dudi.
Kdt qua chpn lpc dupc 68 con gd mdi, theo ddi de tning vd dem ap, sau do theo ddi stnh trudng ddi con.
2.2.2. Khdi Iwmg ca thd duoc chon & cac tuan tudi
phuong phap thu thdp sd ligu: Can khdi lupng timg ca thg dcac tuan tudi 1, 2,..., 17 tuan tuoi bdng can dign tu vdo sang som khi chua cho dn, cho udng.
2.2.3 Kha ndng de tning
2.2.3.1. Tudi de qua trung dau tidn vakhdiluong gd khi de qua trung diu tidn
La thdl gian tir khi ga moi nd ddn khi de qua tning dau tidn (ngay) va tuoi thdnh thuc cua dan ga khi cd ty lg de 5%. Can khdi lupng ga khi de qua tning dau tidn va khi dat ty lg de 5%.
2.2.3.2. Ty le de qua cac tuin tuoi
Sd lupng hTing tiiu dupc trong timg tuin va tinh ra ty Id de cua gd trong timg tuan:
Tdng sd tning de trong tuan (qua)
Tyldde(%) = xlOO Tdng sd mdi cd mdt trong tuan (con)
2:2.4. Phuong phap xti ly so lieu
Ddnh gid vg tdng khdi lupng co the ga qua cac tuin tudi, sir dung md hinh phdn tich:
Trong dd: Y„ii la khdi lupng co thd ga d tuan tuoi th^ i,'gidi tinh j ;
i^ H Id trung binh chung;
• T,: anh hudng Clia tuin thti i (i= 1 . . . 17);
S,: anh hudng ciia gidi tinh (trdng, mdi), j = 1, 2 (11a trdng, 2 la mai);
e^i,: dnh hudng ngdu nhidn.
Dg bidu thi sinh trudng ciia gd qua cac tuan tuo:, sir diing hdm sinh tnrdng:
Y = e^*(^'*«hodc h i ( Y ) = b o + ( b , * t ) .
Trong do: e Id c a sd logarit ttr nhidn; b„ vd bj 1;
c^c hg sd hdi quy ctia phuong trinh; t Id tiidi giai (tudn).
Cdc sd Ugu dupc x& ly b i n g phIn mdm Minitj^
V16.2.0.
2.2.5. ChSm sdc. nudi dudng
Dan gd sinh san dupc nudi nhot t ^ trung ci vudn tha (tiieo kidu bdn chdn tha), bd tri mdng in, mdng udng trong chudng, chd dp dn tiieo kidu ti^do, Chd dp dinh dudng ddi vcri ga flieo ddi sinh trudng: chia thanh 3 giai doan: 0 4 tuan hidi, S^ tuii tudi, 9 -17 tuan tuot. Thanh phin dinh dudng tuong irng: Ndng Iupng (Kcal/kg): 2900, 3000, 300ft Protein 19,17,1S169&.
Ddi vdi ga Ri theo doi de tning nudi tiieo 3 giai doan: gd con 0-7 tuin tudi, gd hdu bj 8-19 tuin ttM^
gd de tir 20 tuan tudi trd di; chd dd dinh dudng tuoiig img ndng lupng 2950, 2750, 2800 Kcal/kg; protein 18, 14-14,5, 15-16%. Mdt do tuong ting 3 giai doan 12 con/m^, 8 con/m^ va 5 con/m^ ngn chudng; ch^ 35 dn ttrdo.
Phuang thiic nuoi theo 3 giai doan trgn: wk chung trdng mai ltic ga con; nudi ridng trdng, ni giai doan hau bi; ghep trong mai 1 trdng/10 ml^fcc
len de.
m
Tidm phdng vdi cac bgnh nhu ddu, mari newcatson, gumboro.
S.KETQUAVATNAOUIAN 3.1. Kdt qud chpn lpc gd Ri
Bdng 1. Tyld gd Ri tiieo cdc mdu Idng khde nhau trong ddn gd dia phuong Mau sac
S^ lirong (con) TylS(?l)
Vang rom 78 19,5
Do da 120 30,0
Vang dSt
56 14,0
Den 82 20,5
Miu khic 64 16,0
TJU
400
lif
Kft qua duQc trinh bay 6 bSng 1 cho thSjcIt g4 Ri ving rom trong t6ng d t o g i nghien ciiu i iiaithSp 19,5%).2 ' W i l i r p n g c o t h « g 4 ctuSntuiSl luong CO th^ g4 con tii 1 d^n 17 tirfnt ca th« dupc chon trong 400 con p i lupc trinh nay a b i n g 2.
78
N6NG NGHIIP VA PHAT ;, IEN N6NG TH6N - KV 2 . THANG 10/aKHOA HQC CONG NGHC Bill);2
Tuin
tu6i1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Khdi lupng S d c a t h I
theo dfii 53 53 53 53 53 53 53 53 53 53 53 53 53 53 53 53 53
co&ii^bcic tuin tudi fe) K h «
lupng fe)
42,3 56,5 86,7 128,2 273,8 339,6 511,4 544,5 603,6 683,7 764,3 859,3 903,6 1009,6 1077,9 1167,7 1185,7±SD 7,3 8,9 12,3 39.5 49,6 82,1 98,2 105,3 125,8 121,0 155,5 179,3 174,7 181,1 149,4 204,9 193,8
±SE 1,0 1.2 1,7 5,4 6,8 11,3 13,5 14,5 17,3 16,6 21,4 24,4 24,0 24,9 20,5 28,1 26,6 Kdt qua d bang 2 cho thay, khdi lupng ga Ri tdng n Iheo tuin tudi: tir 1 dgn3 tuin tudi tdng dupc 44,4 'con; tu 3 dgn 5 tuin tudi tdng dupc 187,1 g/con; tir Jgn 7 tuin tudi khdi lupng tdng dupc 237,6 g/con;
7 ddn 9 tuin tudi khdi lupng tdng dupc 92,5 g/con;
9 dgn 11 hiln hidi khdi lupng tdng dupc 160,7 'con; til 11 dgn 13 tuin tudi khdi lupng tdng dupc 19,3 g/con; tir 13 dgn 15 tuan tudi khdi lirpng tdng rpc 174,3 g/con vd tir 15 dgn 17 tuin tudi khdi png tdng 107,8 g/con. Nhu v$y, cd thg nhdn thiy ng trung binh khdi lupng co thd gd tOr 1 ddn 3 tuin di tdng ch$m, tir 3 ddn 5 tuin tudi b i t dau tdng ianh, tu 5 ddn 7 tuin tudi tdng nhanh nhit, sau dd ng dn dinh cho ddn 17 tuin tudi.
Kdt qud nghidn ctiu cua chiing tdi vd khdi lupng k llic 1 tuin tudi vd 5 tuin hidi t h ^ ban so vdi kdt id Clia Nguygn Huy Dat va cpng su (2004) t ^ :ung tdm Nghidn cthi Gia d m Van Phtic d thg hg lit phdt CM tild Id 42,3 g ± 1,01 so vdi 54,7 g d 1 In tudi vd 273,8 g so vdi 296,5 g d 5 hiln hidi.
\6i lupng CO thd binh qudn cua gd 7 tuin tudi trong
;hign ciiu cua chiing tdi tuong duong vdi kdt qua 'hidn Ctiu cua cdc tdc gia trdn, cu thd 511,4 g so vdi e , 9 g .
i Kdt qud nghidn ctiu ciia Nguydn Huy Dgt vd ng si; (2008) vg sinh trudng ciia gd Ri vdng rom
•ng didu kign bdn chdn tha dd cho tiily, khdi Iupng Ri Itic 10 tailn hidi vd 12 biln hidi dgt 724,5 ±13,9
g/con vd 868,6 018,4 g/con, cao hon kdt q u i nghidn cim ciia chting tdi (683,7 ±16,6 g/con vd 859,3 ±24,4 g/con); nhung d 16 tuin tudi khdi lupng co thd binh qudn d gd trong nghidn ctiu cua chiing tdi c6 phin cao hon (1167,7 ±28,1 g/con so vdi 1104,2 ±25,3 g/con).
Mtic dp bign dpng vd khdi Iupng co tiig gd trong ddn nghidn ctiu dupc thd hign qua gid trj ±SD ngdy cdng t3ng theo tudi. Didu ndy cho phdp nhdn djnh Id kha ndng chpn lpc theo khdi Iupng d giai dogn gd tnrdng thanh sd cho hidu qud cao.
Quan hg giiia khdi Iupng vd tuin tudi dupc xdy dtmg bdng phuong trinh hdm sinh tnrdng:
hi(Y)= 4,185+ 0,201t
Vdi hg sd xdc dinh R^ - 0,834 vd kidm djnh cdc hd sd ctia phuong trinh iing vdi xdc suit P < 0,001.
Nhu vdy, mdi quan hg giua tuin tudi vdi khdi lupng CO thg Id hodn toan dupc gidi thich hlng phuong trinh dupc xdy dyng.
Mdi quan hg trdn dupc thd hign qua dd th) hdm smh trudng dudi day:
Khelluong
Dd th): Smh trudng cAa g l Ri nudi t9i Thua lliidn - Hud tiieo hiln hidi Nhm vdo dd tin chiing tdi thiy. tdc dO tdng vd khdi lupng co tiig bmh qudn ctia gd hi 1 dgn 5 tuin tudi chdm hon so vdi giai dogn hi 5 ddn 10 tuin tudi vd tir 10 tuin tudi trd di tdc dO tdng khdi lupng co tiid binh qudn nhanh n h i t
3.3. Khdi lupng CO tild gdRl tiieo gidl tinh 6 c l c tuin tudi
Khdi lupng co thg gd tir tuin tudi thir 5 trdr di dupc phdn theo gidi tinh: h^ng, mii vd dupc trinh bdy d bdng 3.
5 N G NGHlgP vA PHAT T R I I N N 6 N G T H 6 N - Kt 2 - T H A N G 10/2013 79
KHOA HQC C 6 N 6 NCHt
Bang 3. Khdi
'n^intudi
5 6 7 8 9 10 11 12 13 14 15 16 17
Gidi tinh Trdng Mii Trdng Mii Trdng Mii Trdng Mii Trdng Mii Trdng Mii Trdng Mai Trdng Mii Trdng Mai Trdng Mii Trdng Mii Trdng Mii Trdng Mai
lupng binh quin ca 1h£ g^ tfaeo gidi tinh ^ c i c tuin tudi (k) S d c i thd theo doi
27 26 27 26 27 26 27 26 27 26 27 26 27 26 27 26 27 26 27 26 27 26 27 26 27 26
Khdllupng(^
301,8 246,9 398,6 282,9 588,7 437,0 578,1 512,2 668,1 541,5 738,5 630,9 831,5 699,6 956,7 761,9 975,4 834,4 1117,7 905,6 1156,9 1001,9 1322,7 1018,5 1319,6 1056,7
±SD 35,5 47,4 65,1 51,0 64,9 59,5 121,8 75,6 119,0 99,4 111,4 107,0 166,3 113,7 158,5 143,8 180,0 140,6 168,3 124,3 127,6 129,4 155,8 116,0 174,3 103,2
±SE 6,8 9,1 12,8 9,8 12,7 11,5 23,9 14,5 23,3 19,1 21,9 20,6 32,6 21,9 30,5 27,7 25,3 27,1 33,0 23,9 25,0 24,9 30,6 22,3 34,2 19,9
P
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
< 0,001
790,5 g vi 541,5 so vdi 670,2 g fei mii); d 13 dh 17 tuan tudi cOng cho kdt qua thip hon so vdi kdt quS cua cac tic gii trdn.
Theo Biii Diic Long vi cdng svr (2001) khS lupng CO thd gi luc 12 tuin tudi gi trdng dat 1073,3 ddn 1120,0 g/con vi gi mii dat 922,2 ddn 949,5 g/con thi kdt qua nghifin cuu ciia chiing tdi cd thip hon. NguySn nhin cd thd li do didu ki^n khi hju ctia khu vuc midn Trung cd phin khic nghidt hon vi do din ga chua dupc chpn lpc vd tinh tr^ng khdi lU9ng ndn bidn dpng vd khdi lupng tuong ddi nhidu Um anh huong ddn khdi lupng binh quin chung ctia dto
3.4. Tudi dd qui tning diu tidn vi ty Id dd <*
din
Kdt qua theo dSi ly 1^ de trong din dugc trinb bay d bing 4.
Kdt qui o bing 4 cho thiy tudi dd qui tning^
Bdn cia gi li 130 ngiy, khi dd khdi lupng binh q *
N 6 N G NGHlfP vA PHAT TRIEN N 6 N G T H O N - KY 2 - T H A N G 10/2013Kdt qui d bang 3 cho thay, khdi lupng binh
quin cua gi trdng d tit ci cic tuin tudi ddu cao hon so vdi gi mii (P<0,001), tuy nhidn dp ddng ddu vd khdi lupng trong din gi mii cao hon (d 6 tuin tudi do Idch chuan SD d gi mii li ± 51,0 cdn b ga trdng li
± 65,1; d 10 tuin tudi, gi mii li ± 107,0 vi a gi tidng li ± 111,4; d 17 tuin tudi, gi mii li ± 103,2, cdn d gi trdng la ±174,3).
Kdt qui nghien ciiu ciia chung tdi tuong dirong vdi kdt qui nghien ciiu cua Nguydn Ding Vang vi cOng su (1999), cii thd khdi lupng ca thd a giai doan gi con (9 tuin tudi): con irdng ning 630,4 g, con mii ning 591,8 g so vdi 668,1 ±23,3 g d ga trdng vi 541,5
± 19,1 g dga mil.
Kdt qua nghifin cim ciia chung tOi vd khdi lupng binh quin co thd gi trdng vi gi mii d 9 tuin tudi thip hon so vdi kdt qui cua Nguydn Huy Dat vi (2004) tai Trung tim Nghifin ciiu Gia cim Van Phiic
* thd hd xuit phit, cij thd li 668,1 g fei trdng) so vdi
80KHOA HQC CdNG N G H |
cua gd mdi dat 1200,5 g vd tudi de khi ty lg de 5% Id 135 ngdy tuong iing khdi Iuong binh quan cua ga mdi dgt 1206,2 g. Kdt qud nghidn cthi cua chiing toi so vdi cdc tdc gia Nguygn Huy Dat vd cpng su (2004) d Trung tdm Nghidn cthi Gia cam Van Phtic cho thiy tudi de qua tning diu tidn va ty lg de ciia ga khi dat 5% cd sdm hon mpt it, tuy nhidn khdi lirpng co thd gd d cdc tiidi didm cd tiilp hon (1200,5 g va 1206,2 g so vdi 1275 g).
Bdng 4. Ty lg dd cua ddn gd Ri d cdc tuin tudi Tuin
tudi 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
T u i n d e 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Sdlupng g i m i i
68 68 68 68 68 68 66 66 62 60 57 56 56 54 52 50 49
T y l ^ d e (96) 9,0 12,3 25,6 34,4 25,2 19,7 29,6 32,8 30,9 26,1 22,6 22,9 22,0 25,7 24,2 19,0 18,7 Kgt qua d bang 4 cho thay ty lg de ctia ga Ri rat thip, d tuin tudi thti 20 hodc tuin de diu tien dat ty lg dd 9,0%, sau do ty lg de tdng dan ldn, den tuan tudi thti 23 ttic Id tuin de thti 4 dat dupc ty Id de cao nhat (34,4%). Tir hiln hidi tini 23 ddn hian hidi tiui 34 hic Id tudi dd thu 15 ty lg de hau nhu dn dinh. Tir tuin hidi tiiir 35 hic la hiln de tiiiif 16,17 ty Id de c6 phin gidm xudng. Didu ndy chung to gd Ri cdn mang tinh hoang dd nhigu, d n phai tign hdnh cdng tac gidng dd ndng cao ndng suit sinh san.
Kdt qud nghidn ciht ciia Ld Hong Man vd Nguygn Thanh Son (2001) cho tiily gd Ri cd hidi de qud trung diu tidn sdm (khoang 135 - 140 ngay) vd khdi lupng co tiig ltic bit diu de dat 1200 - 1300 g/con thi kdt qud nghidn ctiu cua chiing tdi cung tuong duong, cu tiid kdt qua nghidn ctiu cua chting
NdNG NGHliP vA PHAT TRI^N N 6 N G T H 6 N - KY 2 - T H A N G 10/2013
tdi v e tudi d e q u a t n i n g d i u tidn va k h i ty lg d e d a t 5%
Id k h o a n g 130 - 1 3 5 n g d y v a k h d i l u p n g c o tiig g d m d i d a t 1200,5 - 1206,2 g / c o n . S o vdi k d t q u a n g h i d n cthi Clia B u i Diic LOng vd c d n g sti (2001) t h i k g t q u a n g h i e n ctic c u a c h i i n g tdi vd tudi d e q u a triing d i u tidn cd p h a n s d m h o n (134 n g d y t u o i s o vdi 130 n g d y va 138 n g a y k h i ty Id d e d a t 5% s o vdi 135 n g d y ) .
4. KET LUAN
G a Ri t r o n g d i d u k i d n c h d n n u d i d T h i r a T h i d n - H u g d a b i p h a t a p n h i e u , c o n h i d u d a n g m a u sdc k h a c n h a u , t y lg m d u l o n g d d c t r u n g ciia g d Ri k h a t h ^ (19,5%).
Ga Ri cd k h a n d n g s i n h t r u d n g c h a m , k h d i l u p n g m d i n d va d c a c t u i n t u o i t h i p , 1 t u a n tudi d a t 42,3 ± 1,0 g / c o n vd d 17 h i a n t u d i d a t 1185,7 ± 26,6 g / c o n .
Ga t r d n g ludn c o k h d i l u p n g c a o h o n s o v d i g d m a i d c a c t u i n tudi; d 17 t u a n tudi, g d h-dng c d k h d i l u o n g 1319,6 ± 34,2 g / c o n va g a m a i d a t 1056,7 ± 19,9 g/con.
Ga Ri cd tudi de qua trting dau tidn tirong ddi sdm, khoang 130 ngay tudi vd khdi lupng co thd gd mai dat dupc binh quan 1200,5 g/con. Ty lg de dat 5%
khi 135 ngay tudi vd khdi lupng co thd gd mdi dat 1206,2 g/con.
Ty Id de ctia gd tuong ddi thip, cao nhit d tuin hidi tiiir 23, ty lg de dat 34,4% sau dd 6n djnh ddn tudn tudi thli 34 va giam dan tir tuin tudi thii 35.
TAI UEU THAM KHi^O
1 Nguygn Huy Dat, Vu Thj Huong vd Hd Xudn Tiing (2004). Nghidn ciru chpn lpc va ndng cao ndng suat ga Ri vdng rom. Bao cdo khoa hpc. Trung tdm Nghien ctiu Gia cam Van Phtic.
2. Nguygn Manh Himg, Hodng Thanh, Biii HCtu Doan, Nguygn Thi Mai (1994). Chdn nuoi gia elm.
Nha xuat ban Ndng nghidp, tr. 104-108.
3. Biii Dirc Lung, Nguydn Huy Dgt (2001).
Nghidn cthi mpt sd ddc didm sinh hpc va tinh ndng san xuat ctia gidng ga ri qua 3 ddi chpn lpc. Bdo cdo khoa hpc ndm 2001. Vign Chdn nudi. Trang 54- 57.
4. Biii Dtic Lung, Nguydn Huy Dat, Vu Thj Huong va Tran Long, 2004. Ddc didm ngoai hmh vd ndng suat cua gd Ri vang rom Vigt Nam d thg hg xult phat qua chpn lpc vd nhan gidng. Trang 30 - 39. Hdi nghi khoa hpc chdn nudi - tini y, Hd Npi. Nhd xult ban Nong nghigp, Ha Ndi.
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KHOA HOC CftMO NGHt
5. Ld Hdng Man v i Nguydn Thanh Spn (2001). Diic Tidn, Lfi Thi Nga, Nguydn Manh Hiing, 1999.
Ky thuit nudi duong g i Ri v i g i Ri pha. Nha xuit Khi ning sin xuat cua g i Ri nu6i tai Tbify Phuong, bin N6ng nghifip. H i Ndi. Chuyfin san Chin nu6i Gia cim. Hdi Chin nu6i
6. Nguydn DSng Vang, Trin Cdng Xuin, Phiing Trang 99-100.
CAPACnY OF GROWTH AND EGG PRODUCTION FORTHE FIRST SELECTED GENERATION OF RI BREED RAISING IN THUA THIEN - HUE CONDmON
Nguyen Minh Hoan Summary
Iti chickens in breeding condition were more doped with different color types, characteristic color ratio of Ri chickens quite low (19.5%). Ri chickens likely slow growth, expansion and new volmne in the low-weeks old, 1 week old; 42.3 ± 1.0 g at 17 weeks of age and reached 1185.7 ± 26.6 g. Body weight of rooster is always higher than hens in the week-old and at 17 weeks of age, males weighing 1319.6 ± 34.2 g and hens reached 1056.7 ± 19.9 g. Chickens lay eggs year-old Ri is the first relatively early, around 130 days of age and body weight gain per hen 1200.5 g. Birth rate was 5% for 135 days of age and body weight of hens at 1206.2 g. The rate of chickens laying relatively low, the highest in 23 weeks, birth rate was 34.4% and then stabilized to 34 weeks of age and decreasing from the 35th week.
Keywords: Bantams, selection, mass, /ay egg.
Ngudi phin bidn: PGS.TS. Nguydn Vin Diic Ngiy nhin bii: 10/6/2013
Ngiy th6ng qua phan bi^n: 15/7/2013 Ngiy duy^t ding: 22/7/2013
