PAKISTAN
VETERINARY
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previous page   Pak Vet J, 2002, 22(3): 120-123   next page
 

REPEATABILITY ESTIMATES OF SOME PRODUCTIVE AND REPRODUCTIVE TRAITS IN RED SINDHI CATTLE

Muhammad Iqbal Mustafa, Muhammad Khalid Bashir1, Arfan Yousaf2 and Bashir Ahmad

Department of livestock Management, 1Department of Animal Breeding and Genetics, 2Department of Clinical Medicine and Surgery, University of Agriculture Faisalabad

Abstract   

    The breeding records of 179 Red Sindhi cattle maintained at the Livestock Experiment Station Hab Choki, Balochistan, during the years 1982-97 were used in the present study. An effort was made to estimate the repeatability for some productive and reproductive traits by using the Mixed model least squares and maximum likelihood procedures. The repeatability estimates for milk yield, lactation length, dry period, service period, gestation period and calving interval were 0.361 ± 0.05, 0.03 ± 0.05, 0.029 ± 0.06, 0.17± 0.06, 0.94 ± 0.55 and 0.167 ± 0.06, respectively in model 1, whereas in model 2 estimates for milk yield, lactation length, dry period, Service period, gestation period and calving interval were 0.354 ± 0.05. 0.041 ± 0.05, 0.040 ± 0.06, 0.173 ± 0.06, 0.98 ± 0.056 and 0.165 ± 0.06, respectively. The repeatability estimates are used in determining the amount of culling that can be safely done on the basis of records. A high estimate of repeatability provides enough evidence for selection or rejection of the individual based on single record. Whereas a low estimate of repeatability justifies accumulation of further records. A moderate estimate of repeatability (0.361) for lactation milk yield obtained in the present study indicates that the cows can be selected for milk yield on the basis of relatively lesser records in the present herd    

Key words: Repeatability, productive and reproductive traits, Red Sindhi cattle. 

 
   

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



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