Reproductive Response in Seasonally Anestrous Suffolk Ewes After a Treatment Combining Melatonin Feeding and the 'Male Effect'

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概要

• 論文の詳細を見る

• Fifty-eight anestrous Suffolk ewes, raised in Hokkaido, were randomly divided into 2 groups, with or without melatonin feeding as follows: Group 1 ewes (n=33) were fed melatonin daily for 45-90 days from the early or mid-anestrous season (late March to June) and Group 2 ewes (n=25) were not. All the ewes were introduced to fertile rams for 6-12 weeks starting between April and July. The incidence of estrus in Group 1 ewes during the joining of the rams was higher than that in Group 2 ewes (100% vs. 32%, p<0.01). The first estrus in Group 1 was observed 7-10 weeks after the beginning of melatonin feeding. The intervals from the ram introduction to the onset of estrus in 8 ewes that showed estrous response in Group 2 were not distinguishable from those in the ewes fed melatonin for over 5 weeks before the ram introduction in Group 1. The conception rate in Group 1 was higher than that in Group 2 (93.9% vs. 8%, p<0.01). The prolificacy in the Group 1 and 2 ewes was 148% and 8%, respectively. These results indicates that Suffolk ewes were responsive to the male effect 5 weeks onward after the start of the melatonin feeding during early and mid- anestrous season.

• 日本繁殖生物学会の論文
• 1996-08-01

著者

• Ohara Mutsuo

  Takikawa Animal Husbandry Experiment Station Of Hokkaido

• KUSAKARI Naohito

  Hokkaido Prefectural Shintoku Animal Husbandry Experiment Station

関連論文

• Seasonal Variation in the Timing of Estrous Behavior, LH Surge and Ovulation Following the Treatment with Progesterone and PMSG in Suffolk Ewes
• メラトニンフィーディングを用いた受胎促進システムが北海道に飼養されているサフォーク種雌ヒツジにおける2年間の繁殖成績に及ぼす効果
• Reproductive Response in Seasonally Anestrous Suffolk Ewes After a Treatment Combining Melatonin Feeding and the 'Male Effect'
• Effect of Melatonin Feeding on Early Onset of Reproductive Activity in Postpartum Suffolk Ewes Lactating during Anestrous Season

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