NGUYEN THI MINH - Nghien cihi chgn lgc ndng cao ndng sudi trung...
NGHIEN CUU CHON LOC N A N G CAO N A N G SUAT TRlfNG TAO DONG VIT CO CI
Nguyen Thi Minh''; Hodng Vdn Tieii^ vd Nguyen Dice Trgng'.
; ' 'Trung tam nghien ciiru vit Dai Xuyen; ^ Vien Chan nudi.
* Tac gia de lien he: Nguydn Thi Minh, Trung tam nghien ctiu vit Dai xuyen. Vidn Chan nuoi. Tel: 034.854.250/ 034.854.061; E-mail: minhthaeh(S)netnam.org.vn
= •••• '"> y' • :'>1!. ABSTRACT ^\
, . •, ^ Selection and breeding to improve egg production for CI Co duck line
Co is a local duck breed closed symbiotically to rain-fed nee. It has been reduced the numbers because fanners aimed to high meat production exotic ducks recently. Co ducks have an aptitude for sca\enging on water bodies and fields and foraging for two third their daily need. They are prolific with about 200 eggs per female in 52 weeks laying. Although it is polygamous of one male and 9-10 females, the fertility reaches over 90 %. Co ducks are assessed the second only to Khaki Campbell and Indian Runner as a good laying breed. Now a question is that: How to help poor farmers to get more income? Why don't we improve duck productivity by local genetic resources, while Co ducks are called "Ducks of rain-fed rice" with a huge reproduction potential. Methods of family selection and small population inbreeding were applied by one to seven ratio breeding scheme for Co ducks in DBRC.lt was shown that the egg production improved 17.6 eggs per female higher than before selection; and 21.3 egg per female higher than control group. Other characteristics such as body weight, egg weight, egg quality, fertility, hatchability and also feed conversion was kept stable.
Keywords: duck; selection and breeding: symbiotically: egg production: pure individuals.
' " D A T V A N D E Vit Cd la gid'ng vit ndi gdn bd lau ddi va cdng sinh vdi nen ndng nghiep liia nude, dang cd nguy co giam sd lupng nhanh chdng do thi hidu ciia ngudi chan nuoi hudng tdi nhirng gid'ng vit ngoai nhap eho nang sudt cao. Vit Cd cd kha nang tu kiem dii 2/3 nhu cau thii:e an hang ngay neu dupe chan tha; nang suat trirng khdng dudi 200 trirng/mai/52 tudn de. Mac dii ty Id ghep trdng mai it hon nhieu cac gidng vit khac (1/9 - 1/10), ty le phoi luon dat trdn 90%. Vit Cd dupe danh gia la gid'ng mdn de chi sau vit Khaki Campbell va Indian Runner. Nhidu nude ed nen chan nuoi vit tien tien nhu Anh, Phap, Dire, Trung qudc... tao duoc nhidu gidng vit cd nang suat cao. Tidu ehi ciia hp la tao ra gidng mdi mdt each nhanh chdng. Ciing chinh vi the, cac chi tidu san xuat cita mpt sd gidng td ra khong bdn. Vdn de dat ra la: chiing ta ed ky thuat, tai sao chiing ta khong tu tao gidng vat nudi bang ngudn gen ndi ban? Trong khi vit Cd Viet Nam dupe mdnh danh la "con vit ciia ndn ndng nghidp liia nude" vdi tiem nang de trirng vd ciing ldn. Bang phuong phap chpn loc gia dinh va qudn the nhd. De tai "Nghien cim chgn lgc ndng cao ndng sudt tricng, tgo don^ vit Cd CI " dupe tidn hanh tai Trung tam nghidn ciru vit Dai Xuydn. Ke't qua dupe irng dung tai mdt sd tinh ddng bang sdng Hdng. Nhdm muc dich: chpn tao ddng vit C\, gidng vit tir ngudn gen npi ban, tiet kiem chi phi nhap gidng; lam phong phii bp gidng vit Viet Nam va nang cao nang suat triing ciia vit Cd, tang thu nhap eho ngudi chan nuoi.
Giam thieu 6 nhidm moi trudng va tao cac san pham.ndng nghiep sach bdng cac he thdng chan nuoi phat tnen ben virng: vit-liia; vit-ca; vit-ea-liia khong diing thudc trir sau, tac nhan nguy hai tiem dn cho sire khoe con ngudi.
VAT LIEU vA PHUONG P H A P NGHIEN CUU
VIEN C H A N N U O I - Tgp chi Khoa hgc Cdng nghe Chdn nudi - S d 8 - T h a n g 10-2007
Vdt lieu nghien cuu: la vit Cd ciia Trung tam nghien ciiru vit Dai Xuyen \Vii)/
Thdi gian nghien cicu: Tir nam 2001 ddn 2006.
Phuang phdp nghien cdu
Chpn Ipc qudn the nhd, chpn Ipc gia dinh. Chpn Ipc ddng thdi loai thai ddc lap vdi eae tidu chi: tudi phdi gid'ng TB ; the trpng liic phdi gidng nhd; khd'i lupng trimg vira phai; nang sudt triing cao va ty Id mau ldng canh se. Nang cao nang suat trirng, cac tinh trang khac giir dn dinh, tidu tdn thitc an giam cang tdt.
Che do dn: Vit con 1 - 56 ngay tudi an han che'. Protein 20%; ME = 2850 kcal/kg thiie an. Vit hau bi an han che. Protein 13,5%; ME = 2700 kcal/kg thtic an. Vit de an tu do. Protein
17%; ME = 2800 kcal/kg thirc an.
Cdc tinh trgng theo ddi: Cac tinh trang nhu: ty le nudi sd'ng; kich thudc co the; khd'i lupng trirng; chat lupng triing (chi sd hinh thai, ty Id cac thanh phdn, chi so ldng dd, chi sd long trdng, HU); ty Id phdi; ty Id nd; tidu ton thirc an; ty Id mau ldng canh se qua cac the' he;
cac ehi tidu huyet hpc; khoang each di truydn ciia vit Cd vdi mdt so gid'ng vit khac. Tat ca dupe ghi chep vao ly lich ciia ddng vit Cd CI.
Xicly sdlieu: Bdng chuong trinh MINITAB, Version 13.31
Jl .ii\
KET QUA VA THAO LUAN Ket qua ve ty le nuoi song
Ty Id nudi sdng ciia vit Cd dupe thd hidn tren bang 1 eho thay vit Cd la gid'ng cd ty Id nudi sd'ng cao, ke ca vit chua chpn Ipc va vit thi nghidm, qua eae thd' he ty Id nay dat tren 90%.
Bang 1. Ty Id nudi sd'ng eiia vit Cd • t Chi lieu theo doi
n.
Ty Id nudi sd'ng (%)
Trudc chon loc 1573 97,3
1 1036 98,2
Thd' he chpn Ipc
2 3 1055 734 98,8 97,8
4 602 93,4 • Ket qud ve khdi lugng ca the vd tudi de
Dd thi 1: khd'i lupng co thd ciia vit 1 o u
9
S
3
1
•X
" 1 ! SS
C I j 3B.5
C2 L " ' S
3T 8T
! 346,5 9972 j _ 360,7 1056,6
llian tuoj
• CI • C 2
rTH
21T 1247.8
1312 J
Dd thi 2: So dd de trimg eiia vit CI, C2
So do de trung cua vit 0 1 , 02
-C1.3 — • — C 2 . 3
Bang 2a. Khdi lupng eo the va tudi de eiia vit CI
M,! I / .•
NGUYEN THI MINH - Nghien cuu chgn loc ndng cao ndng sudi trung..
The he Tudi vit
1 ngay tudi: n Trdng Mai 3 tudn tudi: n
Trdng Mai 8 tudn tudi: n
Trdng Mai
C l . l Mean ± SE
219 37,3 ± 0,6 35,6 ±0,5
205 347,8 ± 5,7 336,5 ± 2,4
202 1069,9 ± 17,6
978,2 ± 20,8
C1.2 Mean ± SE
327 36,9 ±0,3 36,2 ±0,1
317 366.6 ±1,8 351.7 ±1,8
317 1071,8 ±12,4
1007,5 ± 8,8
C1.3 Mean ± SE
355 38,0 ±0,3 36,9 ± 0,3
347 358,7 ±4,4 343,3 ± 4,8
347 1073,2 ±14,4
982,3 ±15,0
C1.4 Mean ± SE
287 41,7 ±0,2 40,4 ± 0,3
265 370,8 ± 4,5 354,5 ± 4,2
265 1193,2 ±9,2 1027,5 ± 13,6
Trudc chpn loc
21 tudn tudi:
Trdng Mai
Tudi de (ngay)
128 1525,1 ±8,6 1266,1 ± 12,0
144
163 1525,1 ± 10,3 1266,0 ±10,0
144
162 1529,3 ±10,0 1263,3 ±14,0
144
225 1250,0 ± 13,0 1195,8 ± 18,5
153
1537,8±16,1 1265,2±2,6
163 Bang
The he Chi tidu
1 ngay tudi: n Trdng Mai 3 tudn tudi: n
Trdng Mai 8 tudn tudi: n
Trdng Mai
2b. Khdi lupng co C2.1
Mean ± SE 439 35,9 ±0,5 35,9 ±0,4
431 377,0 ± 7,0 331,5 ±5,7
431 1082,0 ±22,5 1000,0 ± 13,3
the va tudi de ciia vjt C2 khong chpn loc C2.2
Mean ± SE 384 36,1 ±0,5 36,7 ± 0,5
380 339,0 ±8,5 336,0 ± 5,8
317 1004,3 ± 18,0 1000,0 ± 14,2
C2.3 Mean ± SE
240 36.8 ± 0,6 36.9 ± 0,5
235 330,0 ± 8,0 330,5 ± 6,2
235 1063,3 ±22,7 1023,3 ± 16,4
C2.4 Mean ± SE
248 41,9 ±0,2 40,7 ± 0,3
233 422,9 ± 18,7
444,8 ±8,1 233 1215,0± 16,5 1203,0 ± 12,4 21 tudn tudi: n
Trdng Mai Tudi de(ngay)
255 1346,0 ±54,0 1285,0 ±24,4
144
192 1390,0 ±62,0 1306,5 ±21,2
145
162 1356,0 ±40,8 1308,5 ±21,6
146
225 1433,3 ±33,3 1347,8 ± 18,7
153 Khdi luong co the va tudi de ciia vit dupe the hidn tren bang 2a, 2b va dd thi 1. Sau khi can d mdi lira tudi, vit dupe chpn de' dua vao cac lira tudi tiep theo. Sd lieu tren bang 2a, 2b chi ra rdng dp ddng ddu cua vjt Cd dupe duy tri vdi bie'n dpng ca thd rat nhd (Cv% nhd), cd thd' tha'y rd tren dd thi 1 minh hoa. Nhu vay ehi tieu nay da cd xu hudng dn dinh. Tudi de eung dupe dn dinh d 2\ tuan va sdm hon vit chua chpn Ipc 2 tudn (khao sat tren 1573 con vit de chua chpn loc). So sanh Fisher thdy khdi luong eo the khdng sai khac giira eae the he d mdi Ilia tudi; tudi de khdng sai khac giua cac the he nhung sdm hon vit trudc chpn loc 2-3 tudn.
Ket qud ve ndng sudt tricng vd tieu tdn thdc dn
Nang suat trumg va tidu tdn thirc an ciia vit dupe the hidn trdn bang 3 va dd thi 2.
Ve nang suat trirng: theo Pascal Leroy va cpng sir (2003), gen ldn at (major gene) cd the' ed bieu hien ngoai hinh chenh lech tdi 25%, cd kha nang di truydn dupe (tang nang sudt chdng han), ca the hoac ddng nao tap hpp nhieu gen ldn at se cho nang suat khac di. Cac gen
VIEN C H A N NUOI - Tgp chi Khoa hgc Cdng nghe Chdn nudi - S6 8 - Thong 10-2007
nay tuong tac nhau thdng qua hidu iing trdi se cho nang sudt cao hon hoac thdp hon. Phan bao giam nhidm (qua cac thd' he) lam giam tuong tac ddn de'n giam hoac lam hdt hidu iing trdi d mdt sd ca the, do vay bd me tdt cd the sinh ra eon khdng tdt hoac ngupe lai.
Trong qua trinh tao gid'ng vat nudi, vide ke't hpp chpn Ipc qua timg the' he se giam tdi da dupe hidn tupng nay va dinh hudng gid'ng vat nudi theo y mudn. Falconer, Shoffner, Diekerson va cdng sir (trich ddn eiia Leroy, P. va cdng sir, 2003) cho rdng nhan gid'ng ddng huyd't se lam giam khoang 10% nang suat triing tuy co ca'u dan. Dieu nay, khi gia sir anh hudng mdi trudng la khdng dang ke, cd the giai thich sir thang trdm nang suat triitig vit Cd qua cac the' he. Nang suat triing vit Cd CI cao hon khi chua chpn Ipc binh quan la 17,6 trirng/mai; cao hon nang suat triing vit C2 la 21,3 trung/mai. Nang sudt triing thd' he 1 va 2 chenh Idch khdng nhidu so vdi vit chua chpn Ipc, thdm chi Id ddi chiing edn thdp hon. Thd' he 3 nang suat triing tang ldn dang ke, dd thi 2 eho thay vit chpn Ipc cd ty Id de ddng deu hon vit ddi chirng trong 52 tudn de. Ve tidu tdn thiie an: la ehi tidu bidn ddng chiu anh hudng rdt ldn ciia mdi trudng nhu dieu kidn nudi, thay ddi thtic an, thdi tiet, tinh trang sire khoe dan vit, stress, v.v... So lieu trdn bang 3 cho thdy rd dieu dd, bieu hidn d Cv rat Idn d mdi thd' he.
Bang 3. Nang suat trung va tieu tdn thirc an cua vit CI, C2 Thd' he
Chua chpn Ipc C l . l C1.2 C1.3 CI.4 ' C2.1
C2.2 C2.3 C2.4
Nang sua't triing (Trung/mai/52 tudn de)
233,7 248,7 237,7 i i 267,2 - .,
251,5 , ; 226,1 . .;:
211,8 246,7 ,, 235,2
i ' v Tidu tdn thiic an (g/ triing) 190,0 - 250,0
"^ 217,1 ± 12,6 249,9 ± 9,6 - -^ 229,4 ± 4,4 272,7 ± 26,7 213,7 ±12,8 268,3 ± 15,7 224,7 ± 6 , 7 ' 273,2 ±33,2
anbiT
• ;>•.:•
Ket qud ve khdi lugng triing, chdt lugng tritng cda vit CI, C2 ' "'1 ..
Khd'i lupng triing, chat lupng triing cua vit dupe the hidn d bang 4a, 4b.
Khd'i lupng trirng la ehi tidu bidu hidn dac trung ve gidng, rdt it chiu anh hudng ciia mdi trudng (Thummabood. S, 1990). Khdi lupng trung vit Cd tuong ddi dn dinh: CI bie'n ddng tir 63,0 den 65,8g; C2 tir 63,0 ddn 68,5g. HU d tat ca cac the he eiia vit CI, C2 deu ldn hon 80 %; ehi sd hinh dang D/R ndm trong khoang chat lupng triing dp cho phep tir 1,35 de'n
1,44 (Brandchs, H. va Biiehel, H.1978). ':'-
Theo King Henderson (1954, 1978). ehi sd hinh dang triing dp dupe chpn trong khoang 1,35 de'n 1,65; vdi he sd di truyen h^ = 0,57 thi trimg ca 2 nhdm gidng vit Cd deu ndm trong khoang nay. Chi sd Idng trdng bidn ddng rat ldn (Cv ldn); dp day vd trirng bien ddng tuan theo quy luat. Vdi each chpn ngdu nhidn triing vit Cd dd' khao sat, eae sd lieu quan sat dupe ehi ra rdng triing vit Cd la loai trimg ed chat lupng cao, it bi loai thuong phdm, ngoai trir chiu tac ddng ngoai canh lam hdng triing.
So sanh Fisher cho thay chi sd hinh dang trimg, khd'i lupng triing CI khdng sai khac (P<0,05) giira 4 the he; CI va C2 sai khac khdng ed y nghia thdng kd (P>0,05).
Bang 4a. Khdi lupng trirng, chat lupng triing ciia vit CI
NGUYEN THI MINH - Nghien cim chon Igc ndng cao ndng sudi trung..
The he Tham sd P Chi sd Chi sd Chi sd „ . . thdng kd trimg (g) hinh dang Idng trdng long dd
Trudc n. 5760 30 30 30 30 chpnlpc m e a n ± S E 64,4 ± 0,5 1,43 ±0,01 0,110 ±0,010 0,40 ±0,01 85.2 ±1.6
n. 8280 30 30 30 30 m e a n ± S E 63,6 ± 0,7 1,40 ±0,01 0.120 ±0.010 0,50 ±0,01 94,0 ±1,1
n. 4410 30 30 30 30 m e a n ± S E 63,0 ± 0,5 1,39 ±0,01 0,072 ±0,010 0,43 ±0,01 87,2 ± 0,7
n. 5210 30 30 30 30 m e a n ± S E 65,8 ± 0,7 1,39 ±0,01 0,073 ±0,010 0,43 ±0,01 85,2 ±1,2
n. 6730 30 30 30 30 m e a n ± S E 64,3 ± 0,7 1,40 ±0,01 0,084 ±0,010 0,45 ±0.01 82,8 ±1.1
Bang 4b Khdi lupng triing, chat lupng trimg ciia vit C2 ' Cl.l
C1.2 CI.3 C1.4
The Tham sd P Chi sd Chi sd Chi sd
he thdng kd trimg (g) hinh dang long trdng ldng dd HU C2.1
C2.2 C2.3 C2.4
n. 3540 30 30 30 30 m e a n ± S E 64,0 ± 0,5 1,38 ±0,01 0.105 ±0.010 0,58 ±0,01 94,3 ± 0,7
n. 3200 30 30 30 30 m e a n ± S E 63,2 ± 0,6 1,36 ±0,01 0,075 ±0,010 0,57 ±0,01 83,8 ± 0,8
n. f " 3850 '• SQ ' ^ 30 '-. a i - ^ 3 0 - • • - 30 m e a n ± S E 68,5 ±0,8 1,38 ±0,01 0,073 ±0,010 0,43 ±0,01 83,0 ±1,2
n. 3630 30 30 30 30 m e a n ± S E 63,0 ± 0,7 1,39 ±0,01 0,074 ±0.010 0,42 ±0,01 83,2 ± 0,9
Ket qud ve ty le phdi vd ty le dp nd
Ty le phdi va kdt qua dp nd dupe the hien d bang 5 " "^ '^
I
! Bang 5: Ty Id phoi va ket qua dp nd trung vit CI, C2 *
;.H
^ , „ , ,. /-. -. u - • Chd't phdi ^ . ,. , , Ty Id nd/
^ . , . . Thamsd ^ Tyle Chet phoi . - . 5 ; , . Ty le no/ i ' ^
^'^^ thdng kd "• ph6.(%) k y l ( % ) '^y^+tae ^^^.^^^^^ long o {%) ^ " ' (%) l^'f m e a n ± S E 35713 94,1 ±0.9 - - ^^'^^^'^ ''•'^'^' ehonloc
Cl.l m e a n ± S E 2136 92.7± 0,8 2,5 ± 0,3 17,4±0,5 80,1±0,7 74,4 ±1,0 C1.2 m e a n ± S E 3975 91,8 ±0,3 2,5 ± 0,2 16,7±0,3 80,8± 0,4 74,2 ± 0,4 CI.3 m e a n ± S E 3039 92,2 ± 0,3 2,8 ±0,1 16,3±0,3 80,9± 0,3 74,6 ± 0,4 C2.1 m e a n ± S E 1106 90,2 2,3 16.8 80,9 73,0 C2 2 881 92,2 3,9 13,2 82,9 76,4 C 2 3 2349 91,4 3,1 10,5 86,4 77,5
Falconer. Shoffner. Diekerson va cdng sir (trich ddn cua Leroy Pascal va cdng sir, 2003) cho rdng nhan gidng ddng huyd't se lam giam ty Id nd 4,67o. Theo Leroy Pascal; Dang Vu Binh va cdng sir (2003). Nhan gid'ng ddng huyd't lam giam kha nang thu thai, tang kha nang nhidm benh. vi xac sudt ddng hpp tir nhieu hon, se xuat hidn nhieu ddng hop tir benh d dang lan. , . ^ .. _ _ j _ _
VIEN C H A N NUOI - Tgp chi Khoa hgc Cdng nghi Chdn nudi -56 8- Thang 10-2007 Ty Id phdi va ty Id dp nd chiu anh hudng rat ldn va chii ydu bdi tdc ddng ngoai canh.
Ty Id phdi ciia vit CI, C2 deu dat trdn 90%; ty Id nd/phdi dat trdn 80%; trirng vit CI nd thdp hon C2 la 2,8%; trirng vit CI va C2 nd thap hon triing vit chua chpn Ipc tir 4,6 de'n 10,9%.
Ty Id nd/tdng sd bidn ddng theo quy luat tuong tu. Ty Id vit con chd't tdc va chd't phdi ky 2 cao d ca 2 nhdm gid'ng, bidn ddng tir 10,5 den 17,4% (Cv< 10%). Ty Id trung chd't phdi trong qua trinh dp rat nhd, tir 2,3 ddn 3,9% (nhd hon miic 6% cho phep).
.("
>J.r.'i ' P Z nCj'H
* The he 4 chica dp nd.
Phdn tich phuang sai
Phan tich anh hudng cua mdt sd yd'u td ddn nang sudt trimg (GLM; P=95%)
L f D
Bang 6. Anh hudng eiia mdt sd ydu td de'n nang suat triing The he
Cac ye'u td udc tinh
C1.2 C1.3 C1.4
Bd (%)
Khd'i lupng eo the 8 tudn (%) Khd'i lupng eo the 21 tudn (%) Cac ydu to khac (%)
48,5 37,5 0 14,0
51,6
. 37,0 ^^.:..
• :•: 0
11,4
77,8 9,8 2,7 9,7
arl
P<0.05:** P<0,01. L^3
Phan tich anh hudng ddng thdi 2 nhan to, thay rdng ddi vdi vjt ed, ndu khd'i lupng con d 8 tudn tudi dat xap xi lOOOg thi cung anh hudng tidu cue ddn nang sudt trirng ve sau. Sd lieu the' hien tren bang 2a, 2b va 3: khdi lupng eo thd' CI < C2 thi nang sua't trirng CI > C2.
Ung dung tinh loan nay de chpn gidng rdt cd hidu qua.
Tuong quan giira ciia mdt so tinh trang vdi nang sudt trirng
Nang suat trimg tuong quan vdi T^ P Khdi lupng so sinh
Khd'i lupng 8 tudn , - . ;>• :i
Khdi lupng vao de - ..
Tudi de ' ^-i . p Nang suat trirng 8 tudn de ddu , , , , -ir,
Ty Id phdi . Tidu ton thtic an (g/c/ngay)
A/j/c dp dong huyet tdng mdi the he
Dupe tinh theo CT eiia trudng Dai hpc IOWA, tren md hinh dan gid'ng sd lupng nhd.
Bang 7. Mire dp ddng huyd't tang mdi the he 0.955 -0.815
0.823 0.445 0.861 0.842 0.764
< 0.001
< 0.001 - - • >0.05
. <0.05
< 0.001
>0.05
<0.01
The he A F (%)
C l . l 0,89
C1.2 0,63
C1.3 0,68
C1.4 0,58 Ap life chpn Ipc, ly sai chpn Ipc, hieu qud chpn Ipc , ^ .rs'i, rt?
Dupe tinh theo Leroy Pascal ; Dang Vu Binh (2003). -f; '•''
Bang 8. Ap lire chpn Ipc, ly sai chpn Ipc, hidu qua chpn Ipc
Tinh trang C l . l C1.2 CI.3 C1.4
"v> :• NGUYEN THI MINH - Nghien ci'm chgn lgc ndng cao ndng sudt trUng .
Ap luc chon loc ( % ) . , , ^ . . . , . , . . , 69,60 58,10 54,70 88,50 Ly .sat chon loc '' T T , ' 10'39 0,95 0 0 Hidu qua chpn Ipc udc tinh "" '^ • 2,28 0,09 0 ' 0 He sd di truyen nang sudt triing theo bd 0^22 0,10 0 0
KETLUAN
Qua 4 thd' he nghidn ciiru tao ddng vit Cd CI, cac ddnh gid so bp sau day dupe dua ra:
De tai da dat dupe muc dich: nang sudt trirng 52 tudn de eiia vit Cd CI dat binh quan 251,3 triing; C2 dat 230,0 trung. Nang suat trimg cao hon khi chua chpn Ipc binh quan la
17,6 trirng/mai; hidu qua chpn Ipc la 21,3 trirng/mai.
Mpt sd chi tidu khac nhu khdi lupng co the, khdi lupng triing, chat lupng triing, ty Id phdi, ty Id dp nd... dupe giir dn dinh. Tudi de triing ddu sdm hon vit chua chpn Ipc 2 tuan.
Tidu tdn thiirc an/trirng bidn ddng nhidu do phu thuoc nhidu ydu td ngoai canh.
He sd di truydn nang sudt trung theo bd d the he 1 la 0,22; the he 2 la 0,10. Mure dp ddng huyd't tang ldn d cac the he la 0,89; 0,63; 0,68 va 0,58%..
f T A I LIEU THAM K H A O
Trin Van Chi'nh (1998) Hudmg din thiJc tap phin mem thong ke STATG7, MSTAT va MTNTTAB. Giao irinh cua b6 m6n Di truyfen giong, khoa Chan nu6i thiJ y, truong DHNL TPHCM.
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Nguyin Van Due (2002). Mo hinh thi nghiem trong n6ng nghiep. NXB NN, Ha Noi. , Hisato Okabayashi, Yuichi Tanabe, Yoshio Yamamoto. Nguyen Thi Minh, Dang Vu Binh (1991). Genetic
constitutions of native duck in North Vietnam. Japanese Poultry Science. Vol.36. No.4. July 1991.
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