Oestrus patterns of progesterone-treated Yankasa ewes in the hot dry and late wet seasons

Oladimeji, B.S., Osinowo, O.A., Alawa, J.P., and Hambolu, J.O (1993) Oestrus patterns of progesterone-treated Yankasa ewes in the hot dry and late wet seasons. In: Abstracts from the Annual Conference of the Nigerian Society for Animal Production. p. 113. From: 18th Annual Conference of the Nigerian Society for Animal Production, 21-25 March 1993, Owerri, Nigeria.

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Abstract

Differences in oestrus patterns of 20 Yankasa ewes of 2 age groups (Adult vs Yearling) in hot dry and late wet seasons were investigated in a 2 X 2 X 10 factorial experiment. Mean oestrus cycle length was significantly (p<0.001) affected by season, with the hot dry season (30.88± 2.4) abnormally having longer cycles than the late wet season (18.40±0.15). None of the factors under consideration significantly affected the mean duration of oestrus (p>0.05). Season significantly affected the frequency of oestrus, while age group did not. No behavioural oestrus were observed for 60 and 0% of the ewes in the hot dry and late wet seasons, whereas 25, 15 and 0% of the ewes in the hot dry and 5, 10 and 85% of the ewes in the cold dry season came on heat once, twice and thrice respectively, within a period of 40 days. The observed disruptions in the oestrus cycle of the ewes in the hot dry season confirm the heat stress effect on the reproductive behaviour of ewes.

Item ID: 35696
Item Type: Conference Item (Abstract / Summary)
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Date Deposited: 12 Sep 2017 00:29
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070206 Animal Reproduction @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830310 Sheep - Meat @ 100%
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