Genetic evaluation of Frieswal cattle for first lactation milk yield from smallholder dairy production systems in Kerala, India
2023
DAS, A K | MITRA, ABHIJIT | KUMAR, RAVINDER | SINGH, UMESH | KUMAR, SUSHIL | RAJA, T V | ALEX, RANI | KUMAR, K ANIL | SIROHI, A S | SAHA, SIDDHARTHA
The present investigation was undertaken to determine the genetic worth of Frieswal (62.5% HF × 37.5% Sahiwal) young bulls through progeny testing under field conditions in Kerala state, India. A total of 65 Frieswal bulls were evaluated based on 1037 first lactation records of their daughters calved over a period of 15 years from 1995 to 2010 were used for the study. The overall average breeding value for the first lactation 305-days milk yield was estimated as 2229.19±50.91 kg with a range of 2193.74±66.59 to 2280.62±66.59 kg. Out of 65 bulls inducted in 7 different sets, 33 bulls (50.7%) had breeding values higher than the herd average (2229.19 kg). The number of daughters per bull varied from 7 to 51 whereas the average number of daughters per bull was 16. The genetic superiority and percentage genetic superiority of the top 25 bulls (38.46%) over population ranged from 6.26 to 51.43 and 0.28 to 2.30, respectively. The least squares analysis of variance revealed that the year of calving had a significant effect on the first lactation milk yield of daughters. The increasing trend of first lactation milk yield over year / bull set observed in the present study indicates the successful implementation of large-scale progeny testing programme under field conditions.
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Эту запись предоставил Indian Council of Agricultural Research