Genetic and non-genetic factors affecting semen production and quality characteristics of Gir cattle breed under semi-arid climate
| Autor: | K.G. Bhave, C. Joseph, T Shirsath, R. Venkataramanan, K. Thilak Pon Jawahar, P. Kumarasamy, P Deshmukh, T Sivakumar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
endocrine system
gir 040301 veterinary sciences Veterinary medicine Semen bull effect Biology SF1-1100 Cryopreservation 0403 veterinary science Semen quality Animal science fluids and secretions SF600-1100 repeatability Acrosome General Veterinary urogenital system 0402 animal and dairy science longitudinal analysis 04 agricultural and veterinary sciences Repeatability 040201 dairy & animal science Sperm Breed Animal culture and semen production Spermatogenesis Research Article |
| Zdroj: | Veterinary World, Vol 13, Iss 8, Pp 1714-1718 (2020) Veterinary World |
| ISSN: | 2231-0916 0972-8988 |
| Popis: | Aim: This study aims to evaluate genetic and non-genetic factors influencing semen production potential of Gir bulls. Materials and Methods: Data on semen quantity (n=6911) and quality (n=466) available from January 2011 to December 2018 at BAIF's frozen semen station, Jind, Haryana, India, were utilized for the study. Factors, namely, season of collection, age at collection, and bull (random effect) were studied for their effect on quantitative and qualitative semen traits. Least square means for the traits were obtained using a general linear model. The effect of age within bull for repeatable traits was analyzed using a longitudinal model with age as the control variable. Multivariate analysis using mixed repeatability model equation was utilized to estimate bull effect correlation (genetic + permanent environmental correlation), phenotypic correlations, and repeatability. Results: The overall least square means of ejaculate volume, sperm concentration, total sperms, initial and post-thaw motility, hypo-osmotic swelling test, and acrosome integrity of frozen semen were 6.62±0.03 ml, 1.22±0.01 109/ml, 8.09±0.05 109/ml ejaculate, 75.78±0.001%, 55.92±0.0001%, 55.13±0.005%, and 71.08±0.001%, respectively. The season of the collection showed a significant effect on volume, concentration, total sperm, and initial motility. The performance of bulls was superior in summer season, followed by winter and monsoon. Increase in semen attributes during summer season was due to the effect of lower temperature on sensitive stages of spermatogenesis. Age at collection had a significant effect on all semen traits. Volume and total sperm count showed increasing trend while concentration showed a decreasing trend with an increase in age. Motility and quality traits did not show any particular pattern. Individual bulls showed differences in all the semen performance traits with age. The repeatability of the traits ranged from 0.04 (HOST) to 0.58 (acrosome integrity). Bull effect correlation ranged from –0.73 (initial motility and acrosome integrity) to 0.93 (HOST and acrosome integrity). Conclusion: Individual bulls showed variation in traits measured over age. The result of the study could be utilized in suggesting suitable management plans to achieve the desired profit by improving semen quality in Gir bulls. |
| Databáze: | OpenAIRE |
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