DI TRUYEN - niONG VAT NUOI
Khadem A., Hafeiian H. and Rahimi-Mianji C.
(2010), Association of single nucleoHde pohTnorphisms in IGFl, IGF-II and IGFBP-II with production traits in breeder hens of Mazandaran native fowls breeding station. Afr J. Biol, 9(6): 805-10,
Do va Anh Khoa (2012). Anh huong cua dpi bien diem C1032T tren gen 1CFBP2 tren cac tinh trang nang suat thit o ga tau vang, Tap chi Khoa hpc Tnrong Dai hpc Can Tho, 24(b) 1-7
Lei M, C. Luo, X. Peng, M. Fang, Q. Nie, D. Zhang, G.
Yang and X. Zhang (2007). Polymorphism of Growth- Correlated Genes Associated with Fatness and Muscle Fiber Traits in Chickens. Poult Sci, 86:835-42.
Lei M.M., Nie Q.H., Peng X., Zhang D.X. and Zhang X.Q. (2005). Single nucleotide polymorphisms of the chicken insulin-like (actor binding protein 2 gene associated with chicken growth and carcass traits. J.
Poult Sci-, 84(8): 1911-18,
Mchdi S., Hamidrcza S., AbolfazI G., Nosratollah Z.
(2014). Growth Hormone Receptor Gene Polymorphism and its Associations with Some Growth traits in West- Azarbaijan Native chicken. Bull. Env. Pharmacol. Life Sci,, 3(6); 140-43
Nguyen T.L.A., Sajee Kanharaeng and Monchai Duangjinda (2015), Association of Chicken Growth
Hormones and Insulin-tike Growth Factor Gene Polj-morptusms with Growth Performance and Carcass Traits in Thai Broilers. Asian-Australas J Anim Sci., 28(12). 1686-95.
11. Nie Q., Lei .VL, Duyang J., Zeng H., Tang G. and Zhang X. (2005). Identification and characterization of smgle nucleotide poh-morphisms in 12 chicken groivth- conelated genes by denaturing high performance liquid chromatography. Genet Sel, Evol, 37:339-60.
12. Nie Q.H., Fang M.X., Xie L., Zhou M., Liang Z.M., Luo Z.P., Wang G.H., Bi W.S., Liang CJ, Zhang W. and Zhang X.Q (2008). The PITlgene polymorphisms were associated with chicken growth traits. BMC Genetic, 9.
20-24,
13. Rodriguez S., Gaunt T.R. and Day I.N.M. (2009).
Hardy-Weinberg equilibnum testing of biological ascertainment for Mendelian randomization studies.
Am J Epidemiol, 169' 505.
14. Zahra R., Masoud A., Hamid R.S. and Cyrus A. (2011), Identihcation of a single nucleotide polymorphism of tlie pituilary-specific transcriptional factor 1 (Pit 1) gene and its association ivith body composition trail in Iranian commercial broiler line. African Joumal of Biotechnolog>', 10(60). 12979-83.
ANH Hl/ONG CUA CHON LOC LEN NANG SUAT SINH SAN VA TIEN BO DI TRUYEN CUA 3 THE HE CHIM CUT NHAT BAN
Ldm Vidl Hung''vd Ly Thi Thu Lan' N h a n n h a n bai b a o : 04/12/2019 - N g a y n h g n bai p h a n bifn: 29/12/2019
N g a y bai b a o d u o c cha'p n h a n d a n g : 08/01/2020 T O M TAT
Nghien ciiu d u p c tie'n h a n h n h a m so sanh n a n g sua't sinh san va tieh bg di truyen cua 3 the'hf cliim ciit Nhgt Ban trong 20 tuan de thdng qua chon loc va nhan giong. Td'ng so chim ciit d u p c theo ddi o the'hf xuat phat (THXP) gdm 360 mai va 120 trdng; the'he 1 (THl) gom 240 mai va 80 trd'ng;
the'hf 2 (TH2) gom 120 mai va 40 trong, Ciit d u o c nuoi theo 6 ca the, d u p c an tu' do b§ng Ihiic an chiia 22''nCP va ME 2.900 kcal/kg va d u o c u o n g n u d c t u d o 6 cac the hf, chim ciit deu d u p c theo doi nang suai sinli san trong 20 tuan de. Ke't qua theo doi cho tha'y n a n g suai triing ciit tang dan qua 3 the'hf THXP, THI va TH2 dgt lan lupt 121,3; 126,6; 128,1 qua/mai/20 hian de. Sd trung co phoi, ty If trung co phdi, ty If nd, chi so hinb d a n g va ty If de d T H l va TH2 cao hon co y nghia so vdi THXP Hifu qua chpn lpc T H l so vdi THXP la 5,3 qua trong khi TH2 so vdi T H l la 1,5 qua vdi hf so di truyen lan lupt la 0,36 va 0,28.
TIT khoa: Cut Nhat Ban, ndng suat sinh sdn z'd hieu qud chon loc.
ABSTRACT
Evaluation of the reproductive performance a n d hereditary i m p r o v e m e n t of three generations for Japanese quails
The study of Japanese quail mate selection and continued breeding fertility was conducted to evaluate the reproductive performance and hereditary improvement of three generations of ' Tniimg D?i hoc Tra Vinh
Tac gid lien he, TS. L.im Thai Hung, Tnrong khoa Nong nghiep-Thiiy s I, Tniong Dai hpc Tra Vinh; email: IthungiO'tvu,edu.v
KHKT Chdn nuoi so 255 - ihdng 3 ndm 2020
DI TRUYEN - GIONG V^T NUOI
Japanese quail over 20 weeks of egg laying. A total of 3 generations of Japanese' quails obsen^
consisted of the original generation including 360 females and 120 males the fir-;! otlspnn;;
generation including 240 females and 80 males, and the second offspring generation includuig 120 females and 40 males. Binds were kept in individual cages, fed and given water ad libttiun ivith a diet consisting of 22".. crude protein with an ME of 2,900 kc.il, kg of feed. All results from the generations of la\'ing quails were calculated during a period of 20 weeks. The results shoived that Japanese quails' egg productivit\- gradually decreased from the original generation to the first and the second offspring generation at 12l':3, 126 6, 128:1 cgg/quail/20 wcvk-^ of laying egg respeclivelv. The number of inseminated eggs, ratio ot inseminated eggs, ratio of hatched eggs, shape ratio, and egg laving ratio of Japanese quails in the offspring generations wore higher than that of the onginal generation. Genetic selective efficicncv of the first offspring generation was improved by 5.3 eggs compared to the onginal generation, but genetic selectn e efficiency of tlie second offspnng generation was only 1.5 eggs compared to the first offspnng generation while their heritage coefficients were0.36 and l' 2S respectnely.
Keywords: Japanese quails, reproduettiv performance, and genelic •.eleclive efficiencu
I.BATVANB£
O nudc ta, ehan nudi ait da trd tbanh mpt nghe phd bie'n d nhieu ndng hp vdi cac quy md khae nhau, tir vai tram con tdi hang chyc ngan con (Biii Hiju Doan, 2009). Chim ait giir vai trd quan trpng trong cung cap tning va fhjt phyc vy nhu cau Heu thy trong nudc va xua't khau. Cut dupe nhgp vao nudi d Vift Nam nam 1971 va tong dan da tang len bang ehye trifu eon (Biii Hiiu Doan, 2009). Chan nudi ciit cd nhieu uu diem nhu ehi phi dau tu khdng cao, thu hoi vdn nhanh, cut de nudi, it bfnb, CO tudi thanh thye sdm, de nhieu tning, thdi gian de keo dai, thit thom ngon cd gia tri dinli dudng eao (Biii Huu Doan, 2010). Cut dupc nudi lay tning va Ia\' thit. Hong dd cut de trung dupc biet rpng rai va pbo bie'n hon so vdi cut dugc nudi lav thit (Rogerio, 2009).
Tuv nhien, ke't qua dieu tra so bp ve dan cut nudi tai Tien Giang, Ben Tre v'a Tra Vinh eho tha\- ty If de tning cua eiit ebi dgt 240 tning/eon/nam, ke't qua nay cho tha'y nang suat de tn'mg cua dan cut \ h a t Ban tai Dong bing sdng Cuu Long (DBSCL) ed khu^mh budng giam. Dieu nay ed the do cac gidng ciit trong mpt thdi gian dai khdng dugc chpn Ipc hav chpn phdi nen bi pha tgp d nbieu miie dp khae nhau, Hi dd Iam phan chia thanh nbieu ddng dan toi nang sua't sinh san chenh lech. Vi v.iv, dan cut gid'ng can dupc ehgn lpc va khdi phyc lgi de nang sua't trong dim dugc cai thifn
(Phgm Vein Gidi va civ, 2000; Tran Hue Vien, 2003; Biii Huu Doan, 2009). Vifc kbao sat kba nang sinh san va lien bp di truyen oia 03 the bf ehim ciit Nhat Ban qua 20 tuan dc la nham danb gia lgi nang sua't sinb san thyc teva tie'n bp di truyen sau qua trinh cbpn Ipe va nhan gid'ng ebim cut Nhgt Ban nudi tgi DBSCL.
2. VAT U f u VA PHlTDNe PHAP NGHIEN CUU 2.1. Dia diem
Thi nghifm dugc thyc hifn tai Trgi thyc nghifm Chan nudi, Kboa Ndng nghifp-Thuy san thupc Trudng Dai hpc Tra Vinb.
2.2. Bd tri thi nghifm
Vifc chpn lya ait gid'ng d 3 the'hf dupe dua theo md hmh ehpn lpc ea the xua't sic ait hd'ng va oil mai dau ddngde nban gidng theo pbuong phap aia Dang Vu Binh (2002). Tbe hf xua't phat (THXP) gdm 360 eon mai va 120 eon trd'ng llie 7 tuan tuoi dupc sii'dung de lam dan hat nban. Cut dupc nudi tbeo phuong thiie ea the tren long va ghep ddi giao phdi HI nbien vdi ty If 1 Hdng \'a 3 mai, mdi trd'ng dupc ghep vdi moi mai Hong 3 gid. Cbpn lpc cac ca the cbo nang sua't sinh san cao de Hen hanh nhan gid'ng.
Cut dupc no ra Hi tning aia nhiing ea the cho nang sua't sinb san cao d THXP dupe chpn lya dan de'n 6 tuan tudi can eir vao dgc diem ngoai h'inh dc hinh thanh the'hf 1 (THl). O the' bf 1 cd 240 cut mai va 80 a i t trd'ng dugc chpn
DI TRUYEN - GIONG VAI N U O I
lpc, theo ddi va nhan gid'ng. Chpn nhung ca the cd n5ng suat sinh san cao d THl de hinh thanh dim gid'ng d the'hf 2 (TH2). 6 TH2, tong so cut gom 120 ciit mai va 40 a i t trd'ng dupc nudi duong va tie'p tuc theo doi nang sua't sinb san.
Cut duge nudi theo d ca the vdi difn Hch moi d la 30x42x20em. Cut dupc an tu' do bang thlic an chua protein thd 22% va nang lugng hao ddi 2.900 keal/kg thiic an va duge ud'ng nudc tu' do. Trung duge thu gom luc 16 gid bang ngay va dupc theo ddi trong 20 tuan.
Nang sua't trung, ty le de, khdi lugng tning, ehi so hinh dang tning, ty If tning cd phdi, ty If ap nd va hf so Hen bp di truyen aia 03 the'hf ciit thi nghifm duoc xac dinh:
Khdi Iugng trung dugc xae dinh bSng each can, dudng kinh ldn va nhd cua tning dupe do bang thudc kpp.
Nang sua't triing dupe xae dinh bang each cpng ddn tning theo tirng ea the cut suot thdi gian thi nghifm,
Chi so hinh dang tning dupe xac dinh bang each Hnh ty so' giu'a dudng kinb nhd va dudng kinh ldn eua triitig.
Ty If tning ed phdi dugc xae dinh bang each Hnb ty If (%) giua so'trung cd phdi hen tdng so' triing de cua mdt a i t mai.
Ty If a'p nd eua trung duoe xac dinh bang each tinb ty If (%) giua so cut nd ra cdn sd'ng tren tong so tning de ra eua mdt ciit mai.
Tie'n bd di truyen (TBDT) la hifu qua chgn Ipc cua bat ky mdt Hnh trang nao do tren mot don vi the he, hay la su vu'pt trdi ve gia tri trung binli d the'he eon eiia bo me dupe ehon lam gidng so vdi gia tri trung binh cua dan con ma bd' va me chiing khdng duge ap dung ba't ky mpt phuong phap ehpn lgc nao tren nipt don \'i thdi gian the'hf.
TBDT duge Hnli theo cdng thiie: Aj-=R/
L=i^ h-/L, trong dd: A^ Id TBDT, R Id hieu qua cbgn lgc, i la cirdng do cbgn lgc, 5p Id do licb cbuan kieu binh, Ir la he sd'di truyen, L (thudng dtrgc tinh tbeo dan vi ndm) la khodng cdch tbdi gian giira hai tbe'he (Dang Vu Binh, 2002).
2.3. Xuly sdlifu
Sd'lif u duge xii ly thd'ng ke b5ng ANOVA va so sanh su khac bift tnmg binh cua 3 the'hf bang Tukey cua phan mem Minitab 13.2 (2000).
a.KnQUAVATHAOUJAN
3.1. Nang suat triing ciia chim ciit Nhat Ban trong 20 tuan de oia 3 the hf
Ke't qua theo ddi nang sua't sinh san d Bang 1 cho tha'y, vife ehpn Ipc gid'ng da gdp phan dang kc vao vifc nang cao nang sua't sinh san eua dan eut thi nghifm the hifn qua su khae bift rat cd v nghia thd'ng ke d ta't ea cac chi Heu theo ddi (P<0,001) eua the'hf cbpn Ipe THl va TH2 so vdi THXP trir chi tieu kbdi lugng tning.
Tgng so trung aia dan ciit thi nghifm d TH2 ed su eai Hen dang ke ve so Iupng trung dat 128,1 qua/mai/20 tuan eao ban nang sua't trung binh eiia THl (126,6 qua) va khac bift cd y nghia thd'ng ke (P<0,01) so vdi dan cut d THXP (121,3 qua). Ke't qua nay cho tha'y vife chpn Ipe dan a i t theo hudng di truyen da gdp phan dang ke vao vifc nang cao nang sua't sinh san aia dan cut thi nghifm. Ben eanh dd, ke't qua nghien euu eiing eho tha'y, quail the cut dupc ehon lpc cho nang sua't sinb san cag the liifn nang sua't cag bon ke't qua cua Biii Hiiu Doan (2009) vdi 112,8 qua/mai/20 tuan, Tran Hue Vien (2003) la 126,6 qua/mai/20 hian, Ke't qua nay eho thay, phuang phap di truyen da hd trp Hch cyc trong vife chgn lpc gid'ng theg hudng nang eao sd'lugng trung ciia cut.
Ke't qua o Bang 1 eung cho tbay, cac the he a i t chpn Igc THl va TH2 ludn the hifn kha nang sinh san eao han so vdi THXP, ngoai tru chi Heu ty If nd bau he't cac chi Heu kbao sat nhu sd' tning cd phdi, tj' If cd phdi, sd' eon nd ra, t}' If nd, chi so hinh dang va ty If de, THl va TH2 deu the hien eao ban va khae bift cd y nghia so vdi THXP Tuy nhien, d THl vii TH2 ehi tim tha'y su chenh lfch ed y nghia d ehi Heu sd tning cd phdi va ty If ed phdi, hong dd TH2 ludn the hien cao hon so vdi THl. Ke't qua nay cho tha'y vifc chpn lpc da gdp phan eai thifn nang sua't sinh san aia ait va dua gid'ng a i t dan dn dinh ve nang sua't trung.
KHKT Chdn nuoi so 255 - thdng 3 ndm 2020
D l T k O ^ L N - i^iwiN*..
Bang 1. Nang suit sinh sin trong 20 tuan de ciia cut d 3 the hf
C h i t i e u T o n g s o t r u n g ( q u a / m a i ) So t n m g CO p h o i ( q u a / m a i ) Ty lc CO p h 6 i (%) S o ' c o n n o ra (con) T y Ie n o (%) C h l s o h i n h d a n g (%) K h o i l u c m g t n i n g (g) T v l e d e ( % )
T H X P 1 2 U - ± 0 3 3 2 104.2-iO396
'^^ 5 ' ^ ' h52
•^i.ytcii?:- 7h,] ^ i . i s : ll,S :H tOM S4 r - 0 , 3 6 2
T H l 126,6'iO,lWl lll,9*-±0,774 SS, 2 1 0 , 3 4 3 ]00,6^'11S47 90,2''±t),355 77,I"±0.23(i 11,8±0.044 90,5*±0,470
T H 2 t28,I':!Ll.OI4 119„3'±1,I.15
" 2 S'rO S I ' U H ( . '1,242 .•v.'ft0.52i r 8 2'=0 34(' 11 •i±0.0t<5
P,SL Mean
0 OO0/0,S'5 O.lXXi 0 370 (l,lXX1,lt,''l4 a000Al-3S3 0.000/0,25,'i 0 , , ' : ^ l',l>48 0,000/0,057
Gin clni: Cdc chir cdi a gta In imtig bmh ciMiy hiins ^umg nhau Ihi khdng klun bicl eo y ngliia Ihi'iig ke IP>0.05}.
Ke't qua nghien cuu nay ciing eho thay, TH2 the hifn nang suat cao ban so voi cac ngbien ciiu cua Phdng \'.in Mv (1994); Tran Hue \ien (2003); Bui Hiiu Doan (2009); Tran Hdng Djnb (2010) \'oi lv If de dao dgng lan lupt la S(i,4-SS,3, SS,S-^M,4, 57.6-73.7. Sd.l va 74-80%, ki'l qua ve lv If de cho tha'y dav la mpt ki'l qua rat tdt trong cdng tac chpn lpc dim cut sinh san vai mye lit'u Ipa cbpn nhirng gid'ng cut cd n.ing suat san xua't trung cao, Ben cgnh dd, cbi so hinb dang ciing cao ban cdng bdcua Phdng \'an \ 1 \ (1994) la 76,61-74.14".,;
lv If tning cd phdi eao bim kft qua nghien euu eua Tran Hue Xu'-n (2003) (92')..). Tir nhimg ket qua tren cho llijv nang sua't trung cua ait d.i dupe Ceil thifn \'a chat lugng con gidng qua qua trinh cbpn Ipe da dan on dinb him ve nang sua't.
Vifc ehpn gid'ng chim cut dupc can cii
\'ao myc dieh hmmg tbit boge hudng tning.
Tuy nhien, du hudng tning hay hudng tbit till kba nang sinh san eung deu quan trpng trong chan nudi cut (Biii Hiru Doiin, 2009).
Nghien euu aia Daikwo (2011) ve cac thdng so di truven aia mpt so tinh trgng san \ual trung o ait Nhat Ban nudi trong mdi trudng iihii't dm Thi nghifm \ oi 250 cut mdi san xua't tning, su dyng md binh binh phuang hdn hpp eua Harve\' vii ctv (2010) de uoc Hnh di truven, tuong quan di truyen va kieu hinh cua Hnh trgng san .\ua't trung. Ket qua ghi nhan dupc khdi lupng ait ti'ung binh luc de qua hting dau Hen la I45.7g Tudi trung bmh khi
do trimg d.iii tien la 47,0 ngiiy, sd triing trung binh IT nidi cut mai lii 248 tn'mg/nani, sdlu'png ming dc bang niim co Hiong quan di truyen cao vil anb hudng dang kc vdi tiidi de tru'ng diiu lien, Tir do cho Ihiv cae tinh trang san
\u,ii trung cd the dupc nghien eiiu de eai thifn tbdng qua lai Igo. phucmg phap lya ebpn va lya chpn qua quan sat so lupng tn'mg ed the n.ing cao so Iupng trung dc biing nam vii giam kho.m); t.ii'h cac the bf.
3.2. Hf sodi tniyen ciia 3 thehf ciit thi nghifm Trong chan nudi gia cam, hau bet cac tinh Irang so krgng deii ed y ngbia kinh te' ldn nbu san lupng tning, khdi Iugng triing
\'ii khdi Iu'(.mg eo the. De hoan thifn eae gid'ng gia cam, dicu quan trpng la nhan bie't cac dgi lupng di truyen co ban ciia cac Hnb trang kinh iv, eung nhu miie dp di Iruyen eua eac tinh trgng. Cie chuong trinb chpn gidhg gia earn nham nang eao Hem nang di truyen eua cac con Ihdng qua chon Ipc va lai tgo gid'ng. Ban dau, cac thdng sodi truyen trong thi nghifm chpn Ipe dupc su dung trong udc tinh bf sodi Iruyen vii tuong quan di truyen. Chpn gid'ng thuan cbung nham thie't lap va duy hi cac dac diem dn dinh o cac the hf tiep Iheo. Bang each
"ehgn gid'ng td't nhat", su dung mgt muc dp can huye't nha't dinh va lua ehgn nhung ca the ed pbam chat "vugt Hgi", de cd the phal trien ddng mau cao ban o mpt so khia canb dd'i vdi dan gidhg ban dau (Grandin va Johnson, 2005). Ke't qua ebpn lpc dan ait ebo nang sua't sinb san cao du<;c the hifn a Bang 2.
DI TRUYEN - GIONG VAT NUOI
Bang 2. Hf so di truyen qua 3 the hf
C h i l i e u H i i u qua chpn lpc, R Ly sai chpn lpc, S H e s o ' d i t r u y e n , h- C u o n g d p chpn IQC, i Khoang each the'he, nSm o,,G„
Tie'n bp d i t r u y e n . A,
T H l - T H X P 5,3 15,4 0,36 1,40 0,60 13,3 11,3
T H 2 - T H 1 1,5 4,9 0,28 1,40 0,60 5,4 3,6
Cae thdng so di huyen udc lugng eho eae H'nh Hang kinh te'khac nhau cua cut Nhat Ban dupe bao eao bdi nhieu nghien ciiu (Marks, 1996; Narine vii etv, 2010; Zerehdaran va etv, 2012). Thdng sd'di truyen ebo san Iugng tning va mpt viii rinh trgng sinb san da dugc udc Hnh bdi Mielenz va ctv (2006). Mpt vai nghien eii'u the hifn cac thdng sd' di tniyen ve bf so chuyen hda tliu'c an, Hnh trgng cha't Iugng thit d cut Nhat Ban (Aksit va ctv, 2003; Narine vii etv, 2010; Narine va etv, 2013). Su cai tie'n ve di truyen gid'ng da ebo eae nha di truyen hpe gia earn ca hpi tgn dyng eae dae diem khae nbau d eae ddng bd'mp khae nhau (Marks, 1996).
Vife ehgn lpc gid'ng ciit Nhgt Ban dya tren cae da hinli gen lien quan de'n nang sua't sinb san eua dan ciit thi nghifm hifn tai eho tha'y, eudng dg chgn lpc va khoang each the'hf tbi khdng Hm tha'y sy thay ddi qua cae the'he ebpn Ipe. Tuy nhien, qua 2 the'hf ehpn lpc ebo tha'y, hifu qua chgn Ipe eua THl cao ban 5,3 tning so vdi THXP vdi ly sai chpn loc tuong ddi eao (15,4 qua). Ben canb dd, TH2 ciing the hifn hifu qua chgn lgc (1,5 qua) va Iy sai chpn lpc (4,9 qua) tuong ddi hifu qua so vdi THl.
Tuy nhien, eae ehi so'nay tha'p hem THl so vdi THXP. Ke't qua nay ebo tbay, muc dp on dinh qua eac the'hf cbgn lpc ngay cang cao. Tuong ty, d cac chi Heu dp Ifeh chuan kieu hinh va tie'n bp di tnivcn, THl cd su Hen bg cag hon so vdi THXP va TH2 chenh lfch tha'p hon so vgi THl. Ke't qua nay cho tha'y vifc chpn Ipe ve mgt di truyen da gdp pban nang eao nang sua't sinh san eiia dim a i t thi nghifm
3.3. Tien bo di truyen
Hf so' di truyen (h-) dupe sii dung nhieu trong edng tac chpn gid'ng, Thdng qua bf so di truyen se han che'dugc anh budng cua mdi trudng nggai va tim tbay dupe gia tri di truyen a i a tinh trang nghien ciiu. Hf sd'di truyen eua eae h'nh trang rieng bift la mpt dai lugng tuong ddi dn dinh, nd phu thugc vao cae tinh trang sd' lupng kbac nhau. O gia earn, cae Hnh tigng cd hf so di truyen tha'p (h^0,25) gom ed tud'i de tning, san Iupng tning, cudng dp de. Theo ke't qua nghien ciiu oia Tawefeuk (2001) tren cut Nhat Ban cho tha'y, trong sud't 70 ngay de, hf sd'di truyen oia ciit trong khoang 0,30-0,41.
Tuy nhien, theo Helal (1995), lrong giai doan 12-15 tuan san xua't tning hf so di truyen cua tinb hgng nay nam hong khoang 0,40-0,88.
Trong khi dd, ke't qua nghien cuu hifn tai ve tinh trang nang sua't trung cho tha'y, hf so di truyen cua quan the cut thi nghifm trong 20 hian de d THl-THXP la 0,33 va d TH2- THl la 0,28. Ke't qua ngbien cuu hifn tai cao ban so vdi ke't qua cua Ribeiro va ctv (2017) h-en gid'ng a i t thit UFVl (0,16) va UFV2 (0,22) trong 407 ngay kbao sat va tha'p bon so vdi nghien ciiu eua Helal (1995) va Tawefeuk (2001). Ke't qua nay gan vdi ke't qua nghien ciiu cua Momoh va etv (2014) tren cut Nhgt Ban vdi hf sd' di truyen cho sd' Iugng tning la 0,34. Ke't qua tuang hi' (0,35 va 0,21) ddi vdi hai gid'ng cut thit eho san xua't tning de'n 200 ngay dupc bao cao bdi Mielenz va etv (2006).
Tuy nhien, nghien a i u cua Okenyi va ctv (2013) eho tha'y, hf sd'di truyen cua tinh hgng sd'lugng tning cd xu hudng tang len qua 3 the hf khao sat (THXP la 0,12; THl la 0,33 va TH2 la 0,48). Trong khi dd, nghien cuu hifn tgi eho tha'y ed su giam hf sd'di tniyen qua cac the'hf chpn lgc tit 0,36 (THl-THXP) giam xud'ng 0,28 (TH2-TH1). Theo Falcomer va Mackay (1989), hf so di truven cua Hnh trang so' Iugng tning giam qua nhieu the'hf cho tha'y su on dinh di truyen tang len. Nhu vay, quan the chim cut
KHKT Chdn nuoi so 255 - ihdng 3 ndm 2020
b l TRUYEN - GJONG ^ r ^ i ^
qua qua trinb chpn lpc cd \u hudng on dinh dan ve mat di truyen.
4.KfTLUAN
N.ing suat tning cut TH2 dat 12S,1 qua;
mai/20 tuan de, cao hon THl (126.6 qua/
mai/20 hjan de) va cao hon THXP (121.3 qua/
mai/20 tuan do)
Hifu qua chpn lpc THl so vdi THXP la 5.3 qua; TH2 so vdi THl la 1,5 qua vdi bf <d di truyen lan lupt la 0,3fi \ a 0,28
TAI U | U THAM KHAO
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