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Estimation of Genetic Parameters for Persistency of Lactation in Sahiwal Dairy Cattle

Estimation of Genetic Parameters for Persistency of Lactation in Sahiwal Dairy Cattle

 Ali Zurwan1,*, Muhammad Moaeen-ud-Din2, Ghulam Bilal2, Zia-ur-Rehman1,2 and Muhammad Sajjad Khan1


1Institute of Animal Sciences, Faculty of Animal Husbandry, University of Agriculture, Faisalabad-38040, Pakistan 


2Laboratories of Animal Breeding and Genetics, Faculty of Veterinary and Animal Sciences, PMAS Arid Agriculture University, Rawalpindi, 46300, Pakistan

*      Corresponding author:


The main objective of the present study was to estimate the persistency of lactation in Sahiwal cows using different persistency indices and to estimate heritability of persistency. Data on 808 Sahiwal cows maintained at the Livestock Experiment Station (LES), Jahangirabad, District Khanewal were used for the present study. Persistency of lactation was determined using five indices viz. Wood, Johnson and Hansen, Mahadevan, Ludwick amd Petersen and Gajbhiye and Tripathi. Statistical model included fixed effects of period and season of calving and parity and random factors of animal. Indices values for Wood, Johnson and Hansen, Mahadevan, Ludwick and Petersen and Gajbhiye and Tripathi were 138.66, 75.68, 243.65, 85.84 and 275.41, respectively. Moreover, our results indicated that all indices were significantly affected by period and season of calving and lactation number except that Wood index that did not vary with seasons. Heritability estimates of various indices were low and ranged from 0.004 to 0.067 indicating very lower genetic control. This is the first study to show genetic of persistency of lactation. Although results may be validated using more data and more accurately recorded pedigree for several generations however, this is really useful firsthand information.

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Pakistan Journal of Zoology (Associated Journals)


Vol. 49, Iss. 5, Pages 1937-2341


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