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Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls

AIM: The objective of the study was to evaluate the effects of non-genetic factors on reproduction traits viz. age at first semen freezing and age at first semen use of breeding bulls in Sahiwal bulls by fitting least-squares analysis. MATERIALS AND METHODS: The information on reproduction traits of...

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Autores principales: Naha, B. C., Chakravarty, A. K., Mir, M. A., Jamuna, V., Singh, A. P., Maher, D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Veterinary World 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4774690/
https://www.ncbi.nlm.nih.gov/pubmed/27047178
http://dx.doi.org/10.14202/vetworld.2015.928-931
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author Naha, B. C.
Chakravarty, A. K.
Mir, M. A.
Jamuna, V.
Singh, A. P.
Maher, D.
author_facet Naha, B. C.
Chakravarty, A. K.
Mir, M. A.
Jamuna, V.
Singh, A. P.
Maher, D.
author_sort Naha, B. C.
collection PubMed
description AIM: The objective of the study was to evaluate the effects of non-genetic factors on reproduction traits viz. age at first semen freezing and age at first semen use of breeding bulls in Sahiwal bulls by fitting least-squares analysis. MATERIALS AND METHODS: The information on reproduction traits of 43 Sahiwal breeding bulls belonging to 8 sets of Sahiwal breeding program at Indian Council of Agricultural Research-National Dairy Research Institute (ICAR-NDRI), Karnal (Haryana), India during 27 years (1987-2013) were analyzed using fixed linear model. The information was collected from AI records, reproduction sheets, and bull AI register maintained at different sections of Institute viz. record room of Dairy Cattle Breeding Division (DCB), Cattle Yard, Artificial Breeding Research Centre, ICAR-NDRI, Karnal. RESULTS: The average age at first semen freezing and age at first semen use of Sahiwal breeding bulls was estimated as 3.17±0.01 years and 5.35±0.01 years, with the coefficient of variation 18.93% and 20%, respectively. The overall least-squares mean for age at first semen freezing and age at first semen use was estimated as 3.14±0.09 years and 5.25±0.02 years, respectively, in Sahiwal breeding bulls. Period of freezing/use had significant effects on reproductive traits (p<0.01). Season had no significant effect on any of the traits considered in this study. CONCLUSION: It can be concluded that management inputs such as nutrition, breeding, and optimum environment should be taken care of to optimize age at first semen freezing and age at first semen use for better utilization of superior germplasm.
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spelling pubmed-47746902016-04-04 Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls Naha, B. C. Chakravarty, A. K. Mir, M. A. Jamuna, V. Singh, A. P. Maher, D. Vet World Research Article AIM: The objective of the study was to evaluate the effects of non-genetic factors on reproduction traits viz. age at first semen freezing and age at first semen use of breeding bulls in Sahiwal bulls by fitting least-squares analysis. MATERIALS AND METHODS: The information on reproduction traits of 43 Sahiwal breeding bulls belonging to 8 sets of Sahiwal breeding program at Indian Council of Agricultural Research-National Dairy Research Institute (ICAR-NDRI), Karnal (Haryana), India during 27 years (1987-2013) were analyzed using fixed linear model. The information was collected from AI records, reproduction sheets, and bull AI register maintained at different sections of Institute viz. record room of Dairy Cattle Breeding Division (DCB), Cattle Yard, Artificial Breeding Research Centre, ICAR-NDRI, Karnal. RESULTS: The average age at first semen freezing and age at first semen use of Sahiwal breeding bulls was estimated as 3.17±0.01 years and 5.35±0.01 years, with the coefficient of variation 18.93% and 20%, respectively. The overall least-squares mean for age at first semen freezing and age at first semen use was estimated as 3.14±0.09 years and 5.25±0.02 years, respectively, in Sahiwal breeding bulls. Period of freezing/use had significant effects on reproductive traits (p<0.01). Season had no significant effect on any of the traits considered in this study. CONCLUSION: It can be concluded that management inputs such as nutrition, breeding, and optimum environment should be taken care of to optimize age at first semen freezing and age at first semen use for better utilization of superior germplasm. Veterinary World 2015-07 2015-07-29 /pmc/articles/PMC4774690/ /pubmed/27047178 http://dx.doi.org/10.14202/vetworld.2015.928-931 Text en Copyright: © The authors. http://creativecommons.org/licenses/by/2.0 This article is an open access article licensed under the terms of the Creative Commons Attributin License (http://creative commons.org/licenses/by/2.0) which permits unrestricted use, distribution and reproduction in any medium, provided the work is properly cited.
spellingShingle Research Article
Naha, B. C.
Chakravarty, A. K.
Mir, M. A.
Jamuna, V.
Singh, A. P.
Maher, D.
Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
title Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
title_full Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
title_fullStr Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
title_full_unstemmed Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
title_short Identifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
title_sort identifying factors affecting age at first semen freezing and age at first semen use in sahiwal bulls
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4774690/
https://www.ncbi.nlm.nih.gov/pubmed/27047178
http://dx.doi.org/10.14202/vetworld.2015.928-931
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