Genetic evaluation of test day milk yield vis-a-vis thermotolerance in murrah buffaloes
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Date
2023-12
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LUVAS Hisar
Abstract
The present study was conducted on 646 buffaloes maintained at Buffalo Research Centre (BRC) Department of Livestock Production Management, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar over a period of 28 years (1993-2020). The overall least squares means for ten different test days, FLMY and F305DMY were 3.94±0.06, 7.79±0.07, 8.58±0.07, 8.61±0.08, 8.18±0.08, 6.65±0.13, 6.26±0.12, 5.61±0.12, 5.03±0.12, 4.42±0.11, 2273.68±23.41, 2135.72±18.69 in kg/day, respectively. The effect of period of calving was statistically significant (P<0.01) on all test day records (TD1 to TD10 ), FLMY and F305DMY. The season of calving was statistically significant on TD2 , TD3 and TD4. The effect of regression on AFC was statistically significant effect on TD1 TO TD5 and FLMY and F305DMY. The estimates of heritability of various test day milk records ranged from 0.11(TD9) to 0.52 (TD8). Model 1 was best for all the test day milk records except TD6, FLMY and F305DMY where model 2 was adjudged as the best because of maximum likelihood value.
The average estimated breeding values for traits viz. TD1, TD2, TD3, TD4, TD5, TD6, TD7, TD8, TD9, TD10, FLMY and F305DMY,were 3.94 kg/day,7.90 kg/day,8.66 kg/day, 8.68 kg/day, 8.30 kg/day, 7.91 kg/day, 7.40 kg/day, 6.73 kg/day, 6.18 kg/day, 5.49 kg/day, 2325.92 kg and 2181.42 kg respectively. The rank correlations between the ranking of the sires calculated among Test Days varied from 0.094 (TD1 and TD2) to 0.691 (TD5 and TD6) whereas product moment correlations varies from 0.072(TD1 and TD2) to 0.692 (TD5 and TD6). Rank correlation between FLMY and test days varies from 0.148 (FLMY and TD1) to 0.668 (FLMY and TD7) while product moment correlation between traits ranged from 0.181 (FLMY and TD1) to 0.667 (FLMY and TD7). Rank correlation between F305DMY and test days varies from 0.225 (F305DMY and TD1) to 0.691 (F305DMY and TD7) while product moment correlation between traits ranged from 0.239 (F305DMY and TD1) to 0.700 (F305DMY and TD5).