Changes in Body Weight, Egg Production, Hackle Growth, and Plasma Sex Steroid Hormones and Prolactin during the Annual Reproductive Cycle in Domestic Geese.

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  • IZUMI Tokukazu
    Department of Animal Reproduction, Ishikawa Agricultural College
  • SHIMADA Kiyoshi
    Department of Animal Physiology, Faculty of Agriculture, Nagoya University
  • SAITO Noboru
    Department of Animal Physiology, Faculty of Agriculture, Nagoya University
  • ISHIDA Hiroyuki
    Department of Animal Physiology, Faculty of Agriculture, Nagoya University
  • SATO Koji
    Department of Animal Physiology, Faculty of Agriculture, Nagoya University
  • UCHIDE Kiyoshi
    Department of Obstetrics and Gynecology, Faculty of Medicine, Kanazawa University
  • TOMITA Yoshimasa
    Department of Obstetrics and Gynecology, Asanogawa General Hospital
  • SAKAKIDA Seishi
    Department of Animal Reproduction, Ishikawa Agricultural College
  • NISHIDA Etsuro
    Department of Obstetrics and Gynecology, Faculty of Medicine, Kanazawa University

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Other Title
  • 成雌ガチョウの年間繁殖周期中における体重,産卵性,蓑毛の成長,血中性ステロイドホルモンならびにプロラクチン濃度の変化
  • 成雌ガチョウの年間繁殖周期中における体重,産卵性,蓑毛の成長,血中性ステロイドホルモンならびにプロラクチン濃度の変化〔英文〕
  • セイシ ガチョウ ノ ネンカン ハンショク シュウキチュウ ニ オケル タイ

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Abstract

This study was conducted to elucidate the changes in body weight, feather molts, hackle (cervical tract feather) growth, and plasma sex steroid hormones and prolactin in relation to annual reproductive cycle in adult domestic geese. Maximum body weight was observed in January (three of nine geese started laying), and gradually decreased during laying period (January to June). A positive correlation was observed between changes in food intake and body weight (rs=0.81, P<0.01). Plasma concentration of estradiol started to increase in January and reached maximum levels in coincidence with the highest egg production which occurred in May. Estradiol concentrations showed a positive correlation with egg production (rs=0.84, P<0.01). High levels of plasma concentrations of testosterone were observed from November to April. High levels of plasma progesterone were relatively confined to the second half of the laying period (April to June). Maximum prolaction concentration in plasma was observed in May, and was probably associated with broody behavior in two of the nine geese; this value was significantly greater than those observed in February, March, September and October (P<0.01). Changes in hackle growth showed a negative correlation with egg production (rs=-0.90, P<0.01). The nadir in hackle growth was clearly coincident with maximal egg production.

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