|
|
| |
|
|
| |
Pak Vet J, 2012,
32(1):
122-124
 |
|
|
|
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)
|
