Indian Journal of Animal Research

  • Chief EditorK.M.L. Pathak

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Indian Journal of Animal Research, volume 53 issue 2 (february 2019) : 168-172

Optimum age at first semen freezing in relation to fertility of Sahiwal breeding bulls

B.C. Naha, A.K. Chakravarty, M.A. Mir, M. Bhakat, Ramendra Das, B.L. Saini, P. Boro
1Dairy Cattle Breeding Division, ICAR - National Dairy Research Institute, Karnal-132 001, Haryana, India.
Cite article:- Naha B.C., Chakravarty A.K., Mir M.A., Bhakat M., Das Ramendra, Saini B.L., Boro P. (2018). Optimum age at first semen freezing in relation to fertility of Sahiwal breeding bulls. Indian Journal of Animal Research. 53(2): 168-172. doi: 10.18805/ijar.B-3486.
Early selection of bulls having optimum age at first semen freezing play an important role in improving reproductive performance in a dairy herd. Twenty seven years data (1987-2013)  on age at first semen freezing (AAFSF), conception rate based on first A.I. (CRFAI) , overall conception rate (OCR) and birth weight (B.WT) of 41 Sahiwal bulls belonging to 8 sets of Sahiwal improvement programme at ICAR-National Dairy Research Institute, Karnal, Haryana, India; were adjusted against environmental effects and subsequently analysed. Simple and multiple regression models were used for prediction of CRFAI and OCR of Sahiwal bulls. Among the three developed models (I to III), it was observed that Model III having age at first semen freezing and birth weight fulfil the accuracy of model i.e.; having high coefficient of determination (R2) value (CRFAI = 67% and OCR= 69%), low mean error sum of square (MSSe), low conceptual predictive value (CP value) and low Bayesian information criterion (BIC). The results revealed that optimum age at first semen freezing of Sahiwal bulls should be 2.5 - 3.0 years for 3.10% higher conception rate based on first A.I. (48.86%) and 4.39% higher overall conception rate (48.78%) in comparison to Sahiwal bulls with more than 3.5 years of age (CRFAI :-  45.76% and OCR :- 44.39%). 
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