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Journal of Biological Sciences

Year: 2002  |  Volume: 2  |  Issue: 3  |  Page No.: 160 - 161

Effect of Seasons on the Sex Ratio and Calving Frequency of Cattle Under Farm Condition

M. M. Rahman, M. N. Islam, S. Faruque and B. K. Roy

Abstract

Calving records with sex ratio of births were studied in summer, monsoon and winter of local, crossbred and purebred cows. The higher percentage of birth found during summer (39.07%) followed by winter (32.79%) and monsoon (28.14%) and female and male ratio were 48.25:51.75; 44.66:55.34 and 40.83:59.17, respectively in summer, monsoon and winter in local cows; whereas in crossbred cows, birth percentage is highest in summer (36.96%) followed by winter (35.98%) and monsoon (27.06%) and no significant difference were found on sex ratio of births of crossbred cows. The highest percentage of birth of purebred at Holstein-Friesian and Sahiwal cows are noted in winter (40.93%) followed by monsoon (30.48%) and summer (28.59%) and no significant difference were found on sex ratio of births of purebred cows in different seasons.

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