Wpływ długości dnia na sekrecję prolaktyny i parametry biologiczne wełny owczej
Edyta Molik , Anna Kosiek , Anna Potocka
AbstractChanges of day length affect the productivity of animals. In seasonally breeding sheep changes in photoperiod and thus changes in prolactin secretion influence coat development as well. Molting process especially in breeds with thick wool is connected with day length. The aim of this study was to determine the effect of day length and prolactin secretion on the thickness of wool in sheep. The study was conducted on 10 ewes of fertile Olkuska sheep. Wool samples were collected at different day lengths of May, July, September and December. During this time, blood was collected to determine the prolactin profile. Samples of wool were cleaned and the thickness of hair evaluated. Prolactin concentration was determined by the RIA method. The study showed that the length of the day and thus the changes in prolactin secretion affect the thickness of hair. Thickest hair was found during the shortening of the day when prolactin secretion is low. While during the long day the thinnest hair was observed and the secretion of prolactin was the highest, which may indicate molting process in sheep in the spring and summer period.
|Other language title versions||Effect of day length on prolactin secretion and biological parameters of sheep’s wool|
|Journal series||Wiadomości Zootechniczne, ISSN 1731-8068, (0 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||wool, prolactin, day length|
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