EFFECT OF SEMEN TYPE, BREED DIFFERENCE AND SEASONAL VARIATION ON THE CONCEPTION RATE OF COWS IN ARTIFICIAL INSEMINATION
| Autor: | S. S. Islam, S. C. Dash, A. Ashraf |
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| Rok vydání: | 2001 |
| Zdroj: | Khulna University Studies. :437-440 |
| ISSN: | 2789-2697 1563-0897 |
| DOI: | 10.53808/kus.2001.3.1.0124-l |
| Popis: | The experiment was carried out during August 1996 to December 1998 to determine the conception rate (CR) in artificial insemination (AI) using liquid and deep frozen semen. The effects of season and breeds of cows on CR were also considered. Out of 184 cows and heifers inseminated, 62 were Local, 64 were Local Friesian and 58 were Local Sahiwal crossbreds. Sixty-one (61) and 123 cows and heifers were inseminated by liquid and deep frozen semen respectively. Liquid semen was produced locally at district AI center, Khulna and deep frozen semen was collected from central cattle breeding station, Savar, Dhaka. Average motility of sperm in liquid and deep frozen semen was 70% and 60% respectively. AI was done by recto-vaginal method between 8 to 24 hours after onset of estrous and pregnancy diagnosis of all non-returned animals was done between 60 to 90 days after insemination by rectal palpation method. The animals were reared under semi-intensive condition. Data were analyzed by statistical package ‘MINITAB’. Analysis of variances revealed significant effect (P0.05). |
| Databáze: | OpenAIRE |
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