Serving Activity of a Beef Bull to Heifers in which Estrus was Synchronized

Serving Activity of a Beef Bull to Heifers in which Estrus was Synchronized

Sexual behavior and reproductive efficiency of Nihon Tankaku (Japanese Shorthorn)bull to ll heifers were examined in a 10m×15m free barn, where they were housed for 48 hr during the winter of 1977. Ten of the heifers had been injected with PGF2α analogue 43 hr before the observation started. Estrous...

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Veröffentlicht in:Nihon Chikusan Gakkaiho 1979/04/25, Vol.50(4), pp.235-239
Hauptverfasser: OHTA, Minoru, MASAKI, Junji, SASADA, Hiroshi, WADA, Ryoichi, NIHEI, Akira
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container_end_page 239
container_issue 4
container_start_page 235
container_title Nihon Chikusan Gakkaiho
container_volume 50
creator OHTA, Minoru
MASAKI, Junji
SASADA, Hiroshi
WADA, Ryoichi
NIHEI, Akira
description Sexual behavior and reproductive efficiency of Nihon Tankaku (Japanese Shorthorn)bull to ll heifers were examined in a 10m×15m free barn, where they were housed for 48 hr during the winter of 1977. Ten of the heifers had been injected with PGF2α analogue 43 hr before the observation started. Estrous behaviour appeared definitely in 7 of the treated heifers during a period from 43 to 91 hr after PGF2α injection. Onsets of estrus were not observed at any particular time during the aeriod. The bull mounted 4 to 20 times(89 in total)and ejaculated 3 to 8 times (29 in tota1)for 7 estrous heifers which comprised 6 PGF2α-treated and l non-treated ones. The bull showed serving activity to 6 of the estrous heifers in order. As a result of the trial, 7 of 8 estrous heifers were conceived by housing with a bull for 48 hr.
doi_str_mv 10.2508/chikusan.50.235
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identifier ISSN: 1346-907X
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1880-8255
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source Alma/SFX Local Collection
title Serving Activity of a Beef Bull to Heifers in which Estrus was Synchronized
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