Genetic studies on performance traits in Sahiwal cattle at Pantnagar
Loading...
Date
2022-10
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
The purpose of the present investigation were to study the effects of non-genetic factors on performance traits. The data pertaining to 184 Sahiwal cattle, progeny of 21 sires which was distributed over a period of 31 years from 1986 to 2017, cows maintained at Instructional Dairy Farm, Nagla of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) and animal maintained under AICRP on cattle, Sahiwal. The effects of nongenetic factors of performance traits were studied by least square analysis of data by using the technique described by Hervey (1990). The least squares means for AFC, CI, SP, DP, LL, 305 LMY, TMY, DAPY and PY in first lactation were found to be 1055.27 25.90 days, 540.1115.85 days, 170.013.20 days, 260.6114.58 days, 278.896.12 day, 1911.5142.69 kg, 1969.7649.15 kg, 51.491.88 days, and 9.880.23 kg respectively, and in all lactation LSM for corresponding traits except AFC were found to be 521.097.37 days, 240.107.00 days, 229.388.91 days, 276.283.34 days, 1999.8425.58 kg, 2074.2631.19 kg, 47.701.03 days, and 10.740.1 kg respectively. The effects due to season of calving were observed to be nonsignificance on first and all lactations traits except DP in first lactation and LL in all lactations. The period of calving significantly influenced in first and all lactations. The effects due to parity were found to significant influence on CI, DP, 305 LMY, and PY while non- significant effect on SP, LL, TMY and DAPY. The heritability estimates of corresponding traits in first lactation were observed as 0.310.23, 0.360.24, 0.510.15, 0.230.21, 0.160.19, 0.430.25, 0.440.24, 0.360.24 and 0.540.27. In all lactation found to be 051.0.25, 0.560.20, 0.350.16, 0.290.12, 0.210.10, 0.240.11, 0.420.15 and 0.450.16 respectively. The trait LL and 305 LMY indicated low genetic base. However, other traits of study were medium to high heritable traits. The genetic and phenotypic correlations between first and all lactations traits were ranged from low to high. The estimated breeding values of sires estimated for 305 LMY, TMY and PY by simple daughters average D showed sire code 6 was better. The estimated breeding value of sires by BLUP method sire code 2, 8, 14, 15 and 16 higher than other sires. BLUP method for sire evaluation was better in compression with simple daughters average (D) method.