SIRE EVALUATION OF THARPARKAR CATTLE USING FIRST LACTATION TRAITS

The present study was undertaken on 91 first lactation records of Tharparkar cattle maintained at Livestock Research Station Beechwal, Bikaner, Rajasthan over a period of 15 years (2002-2016). The study was conducted on least squares means, genetic and phenotypic parameters of first lactation traits, breeding value estimation of sires for first lactation traits. The overall least-squares means for first lactation traits viz. AFC, FSP, FCI, FDP, FLL, FLMY, LMY/FLL and LMY/FCI were 1510.88 ± 22.29 days, 149.66 ± 5.15 days, 423.60 ± 6.23 days, 148.14 ± 6.05 days, 283.65 ± 7.65 days, 1832.99 ± 42.43 kg, 6.18 ± 0.14 kg/day and 4.03 ± 0.12 kg/day, respectively. The heritability estimates for first lactation traits viz. AFC, FSP, FCI, FDP, FLL, FLMY, LMY/FLL and LMY/FCI were 0.52±0.070, 0.12±0.166, 0.18±0.232, 0.04±0.030, 0.33±0.288, 0.40±0.394, 0.19±0.142 and 0.15±0.194, respectively. A mixed model least-squares analysis showed significant effect of sire on all the traits. The effect of period of birth was highly significant and effect of season of birth was non-significant for age at first calving. The effect of period of calving was highly significant for first calving interval and significant for first lactation length and lactation milk yield per day of first calving interval whereas effect of season of calving was nonsignificant for all first lactation reproduction and production traits. The breeding values of 10 Tharparkar bulls were estimated for various first lactation traits by four sire evaluation methods: simple daughter's average (D ), contemporary comparison method (CC), least-squares method (LSM) and best linear unbiased prediction method (BLUP). The breeding value for first lactation yield was also estimated by using sire index incorporating one auxiliary trait. The results showed that the LSM had the lowest error variance and highest coefficient of determination for all the first lactation performance traits. Therefore, the LSM method was considered to be the best method of sire evaluation. Although, higher rank correlations (> 0.92) between LSM and BLUP methods of sire evaluation for various traits indicated that there was higher degree of similarity of ranking of the sires (>92%) by both the methods of sire evaluation method for present set of data. Fkkjikjdj xk;ksa esa izFke nwX/k mRiknu xq.kksa ds mi;ksx ls lkaMkas dk sa sa z w q sa s s s a as sa sa z w q sa s s s a as sa sa z w q sa s s s a as ewY;kadu w a w a w a Lukrdksrj 'kks/k xzUFk s s z s s z s s z i'kq qq q vkuqokaf'kdh ,oa iztuu foHkkx q a a z q a a z q a a z i'kq fpfdRlk ,oa i'kq foKku egkfo|ky;] q a q q a q q a q jktLFkku i'kq fpfdRlk vkSj i'kq foKku fo'ofo|ky;] q S q q S q q S q chdkusj ss s 'kks/kdrkZ s Z s Z s Z% xfjek pkS/kjh SS S eq[; qq q lekns"Vk ss s % MkW WW WmfeZyk ikuw Z w Z w Z w vuq{ksi.k q s q s q s orZeku v/;;u esa i'kq/ku vuqla/kku dsanz] chNoky] chdkusj] jktLFkku esa iksf"kr Fkkjikjdj xk;ksa ds 15 o"kZ dh vof/k 1⁄42002&20161⁄2 rd ds 91 izFke nwX/k mRiknu vfHkys[kksa dk iz;ksx fd;k x;kA bl v/;;u esa i'kqvks dh izFke mRiknu ,oa iztuu {kerk fu/kkZj.k] lkaMks ds mRiknu ewY; dk fo'ys"k.k fd;k x;kA bl v/;;u ds nkSjku Fkkjikjdj xk;ks ds iztuu ekud izFke C;kar vkSlr vk;q 1510-88±22-29 fnu] izFke xHkZLFkkiu dky 149-66±5-15 fnu] izFke C;kar varjky 423-60±6-23 fnu] izFke 'kq"d vof/k 148-14±6-05 fnu] izFke nwX/k l=o.k vof/k 283-65±7-65fnu] izFke nwX/k mRiknu 1832-99±42-43 fdxzk] nwX/k mRiknu izfr izFke nwX/k mRiknu vof/k 6-18±0-14 fdxzk izfrfnu ,oa nwX/k mRiknu izfr izFke C;kar varjky 4-03±0-12 fdxzk izfrfnu ik;s x;sA leLr vkadM+ks ds fy, oa'kkxfrRo Øe'k% 0-52±0-070 izFke C;kar vkSlr vk;q 0-12±0-166 izFke xHkZLFkkiu dky] 0-18±0-232 izFke C;kar varjky] 0-04±0-030 izFke 'kq"d vof/k] 0-33±0-288 izFke nwX/k L=o.k vof/k] 0-40±0-394 izFke nwX/k mRiknu] 0-19±0-142 nwX/k mRiknu izfr izFke nwX/k mRiknu vof/k ,oa 0-15±0-194 nwX/k mRiknu izfr izFke C;kar varjky ik;k x;kA U;wure oxZ izfreku fo'ys"k.k esa xk; ds tud dk lHkh xq.kksa ij vFkZiw.kZ izHkko ik;k x;kA izFke C;kar vk;q ds fy;s tUe dh le;kof/k dk izHkko vfr&vFkZiw.kZ ,oa tUe _rq dk izHkko xSj&vFkZiw.kZ FkkA C;kar dh le;kof/k dk izHkko izFke C;kar varjky ij vfrvFkZiw.kZ] izFke nwX/k L=o.k vof/k ,oa nwX/k mRiknu izfr izFke C;kar varjky ij vFkZiw.kZ FkkA C;kar _rq dk izHkko lHkh xq.kksa ij xSj&vFkZiw.kZ ik;k x;kA 10 Fkkjikjdj lkaMks ds iztuu ewY;ks dk fo'ys"k.k larfr vkSlr] ledkyhu rqyuk fof/k] U;wure oxhZ; fof/k] mÙke jSf[kd i{k jfgr fu/kkZj.k fof/k ,oa izFke nwX/k mRiknu ds lkFk lgk;d xq.kksa ds mi;ksx }kjk djus ij U;wure oxhZ; fof/k loksZÙke ikbZ xbZ D;ksafd bl fof/k ds fy, =qfV izlj.k lcls de ,oa n`<+ ladYi xq.kkad lokZf/kd ik;k x;kA gkykafd U;wure oxhZ; fof/k ,oa mÙke jSf[kd i{k jfgr fu/kkZj.k fof/k ds chp mPp in lglEcU/k ladsr djrk gS] fd nksuksa fof/k;ksa ls lkaM ewY;kadu dh mikf/k orZeku fn, gq, vkadM+ks ds fy, leku gSA