Genetic evaluation of Frieswal cattle for first lactation milk yield from smallholder dairy production systems in Kerala, India
| Autor: | A K DAS, ABHIJIT MITRA, RAVINDER KUMAR, UMESH SINGH, SUSHIL KUMAR, T V RAJA, RANI ALEX, K ANIL KUMAR, A S SIROHI, SIDDHARTHA SAHA |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Indian Journal of Animal Sciences, Vol 93, Iss 2 (2023) |
| Druh dokumentu: | article |
| ISSN: | 0367-8318 2394-3327 |
| DOI: | 10.56093/ijans.v93i2.124591 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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