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Optimizing Age at First Use of Semen for Higher Fertility in Sahiwal Breeding Bulls


Affiliations
1 Division of Animal Genetics, ICAR-IVRI, Izatnagar, Bareilly, U.P-243122, India
2 ICAR - Dairy Cattle Breeding Division, National Dairy Research Institute, Karnal-132 001, India
     

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The objective of the study was to optimise the age at first use (AAFU) of semen in Sahiwal breeding bulls which will help in early selection of bulls under progeny testing programme. The data on AAFU, conception rate based on first A.I. (CRFAI), overall conception rate (OCR) and birth weight (B.WT) of 43 Sahiwal bulls during 1987 to 2013 at NDRI centre pertaining to 8 sets of Sahiwal improvement programme at ICAR-NDRI, Karnal, India were adjusted for significant environmental influences and subsequently analyzed. Simple and multiple regression models were used for prediction of CRFAI and OCR of Sahiwal bulls. Comparative evaluation of three developed models (I to III) have showed that Model III, having AAFU and B.WT which fulfill the accuracy of model as revealed by high coefficient of determination, low mean sum of square to due error, low conceptual predictive value and low Bayesian information criterion . The results showed that average predicted CRFAI was highest (49.34%) at <5 years and lowest (44.79%) at > 6 years of age at first A.I./use. Similarly average predicted OCR was highest (48.50%) at <5 years and lowest (44.56%) at >6 years of age at first A.I./use of Sahiwal bulls. In organized herd under progeny testing programme, Sahiwal bulls should be used prior to 5 years which is expected to result in 4.45% better CRFAI and 3.94% better OCR in comparison to Sahiwal bulls used after 6 years of age.

Keywords

Birth Weight, Bull’s Age, Conception Rate, First Semen Use, Sahiwal Bull.
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  • Optimizing Age at First Use of Semen for Higher Fertility in Sahiwal Breeding Bulls

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Authors

B. C. Naha
Division of Animal Genetics, ICAR-IVRI, Izatnagar, Bareilly, U.P-243122, India
A. K. Chakravarty
ICAR - Dairy Cattle Breeding Division, National Dairy Research Institute, Karnal-132 001, India
M. A. Mir
ICAR - Dairy Cattle Breeding Division, National Dairy Research Institute, Karnal-132 001, India
M. Bhakat
ICAR - Dairy Cattle Breeding Division, National Dairy Research Institute, Karnal-132 001, India

Abstract


The objective of the study was to optimise the age at first use (AAFU) of semen in Sahiwal breeding bulls which will help in early selection of bulls under progeny testing programme. The data on AAFU, conception rate based on first A.I. (CRFAI), overall conception rate (OCR) and birth weight (B.WT) of 43 Sahiwal bulls during 1987 to 2013 at NDRI centre pertaining to 8 sets of Sahiwal improvement programme at ICAR-NDRI, Karnal, India were adjusted for significant environmental influences and subsequently analyzed. Simple and multiple regression models were used for prediction of CRFAI and OCR of Sahiwal bulls. Comparative evaluation of three developed models (I to III) have showed that Model III, having AAFU and B.WT which fulfill the accuracy of model as revealed by high coefficient of determination, low mean sum of square to due error, low conceptual predictive value and low Bayesian information criterion . The results showed that average predicted CRFAI was highest (49.34%) at <5 years and lowest (44.79%) at > 6 years of age at first A.I./use. Similarly average predicted OCR was highest (48.50%) at <5 years and lowest (44.56%) at >6 years of age at first A.I./use of Sahiwal bulls. In organized herd under progeny testing programme, Sahiwal bulls should be used prior to 5 years which is expected to result in 4.45% better CRFAI and 3.94% better OCR in comparison to Sahiwal bulls used after 6 years of age.

Keywords


Birth Weight, Bull’s Age, Conception Rate, First Semen Use, Sahiwal Bull.