PAKISTAN
VETERINARY
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Prediction of Standard lactation Milk Yield from Completed Lactations of Longer Duration in Cattle and Buffaloes
 
Muhammad Sajjad Khan*, Zia-ur-Rehman1, Sohail Ahmad2, Faiz ul Hassan and Muhammad Saif-ur-Rehman
Department of Animal Breeding and Genetics, University of Agriculture Faisalabad; 1UAF Sub-Campus Toba Tek Singh; 2KPK Agricultural University, Peshawar
*Corresponding Author: drsajjad2@yahoo.com

Abstract   

The aim of this study was to develop a procedure to adjust lactations of longer duration to a standard such as 305-days when standard lactation milk yield for such lactations could not be recorded. For Sahiwal cattle and Nili-Ravi buffaloes, information on completed lactations for duration of more than 305-days was used for 3054 and 3927 lactations, respectively. Final regression equations to predict standard lactation milk yield (305-day milk yield) (SLMY) from completed lactation milk yield (CLMY) and lactation length (LL) were obtained using multiple regression analysis.

Species

Regression equations

R2 (%)  VIF

Sahiwal Cattle

Predicted SLMY = 1239 + 0.967 (CLMY) - 3.80(LL)

96.5     0.035

Nili-Ravi Buffaloes

Predicted SLMY = 1604 + 0.925 (CLMY) - 4.75 (LL)

96.1     0.039

 




Thus, standard lactation milk yield can be fairly adequately predicted from total milk yield of longer lactations and lactation length using linear regression technique both in Sahiwal cattle and Nili-Ravi buffaloes with reasonable accuracy.

Key words: Buffaloes, Cattle, Completed lactations, Milk yield, Prediction
 
   

ISSN 0253-8318 (Print)
ISSN 2074-7764 (Online)
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