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Influence of Season of Birth on Calving Frequency and Sex Ration in Cattle

M.L. Ali
Sylhet Govt. Veterinary College.

M. Uddin
Sylhet Govt. Veterinary College.

M.R. Hasnath
Sylhet Govt. Veterinary College.

N. Islam
Sylhet Govt. Veterinary College.

Abstract/ Executive Summary:

Calving records with sex ratio of births were studied in summer, winter and monsoon of local, crossbred and purebred cows. The higher percentage of birth wee found during winter (61.68%), followed by monsoon (25.25%) and summer (13.8%) and female and male rotio were 35.71 : 64.29; 48.15 :51.85; and 56.00:43.94 respectively in summer, monsoon and winter in local cows; whereas in crossbred cows, birth percentage is highest in winter followed by summer and monsoon and no significant difference were found on sex ratio of births of crossbred cows. The highest percentage of birth of prurebed.at Holstein-Friesian cows are noted in winter followed by summer and monsoon and seasonal effect was found significnt in sex ratio of purebred cows.

Keywords: Calving percentage, Seasons, Sex ratio.

Location: Savar Dairy Farm

Start Date: 00-01-1981

End Date: 00-12-1983

Program Area: Variety and Species

Commodity: Cattle

Objectives:

To the farmers to adjust breeding plan of animals.

Methodology:

The records maintained of cows reared at Savar Dairy Farm in different seasons were collected and analyzed by chi-square test as per Steel and Torrie (1980), to determine the significant difference between the observed and expected female: male ratio. A total record of 2266 normal birth calving was recorded, out of which 107 records are from local cows, 2090 from crossbred cows and 69 purebred Holstein Friesian cows. All the data were from the records taken between January 1981 to December 1983. The managerial condition of the Farm during the observed period was uniform and seasons taken as summer (March-June), monsoon (July-October) and winter (November-February) for the experiment.

Source of Information: Bang. J. An. Sc. 1999,28(1-2): 129-132, ISSN 0003-3588

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the study it indicates that overall percentages of calving was better during winter followed by monsoon and summer and seasonal effect on sex-ratio of calves did not deviated to far from the expected 50:50 ratio.

Knowledge Management: Journal