PMID: 1206647Dec 1, 1975Paper

Testis growth and plasma LH concentration following hemicastration and its relation with female prolificacy in sheep

Journal of Reproduction and Fertility
R B Land, W R Carr

Abstract

The mean testis diameter of 20- to 25-week-old Blackface, Finn and Merino rams was ranked in the same order as the ovulation rates of females of their breeds. The removal of one testis at 12 or 16 weeks of age resulted in hypertrophy of the remaining testis. The relative increase in testis growth following hemicastration was greatest in the Merino rams (72%), least in the Finns (42%) and intermediate in the Blackfaces (57%), so that it was inversely related to their breed ovulation rates. This hypertrophy was associated with increases in the concentration of plasma LH in all breed types. The results indicate that differences in testis growth rate are associated with differences in gonadotrophic stimulation rather than in intrinsic growth potential, and it is postulated that these may arise from breed differences in sensitivity to negative feed-back from the testes.

Citations

May 20, 2000·Small Ruminant Research : the Journal of the International Goat Association·S Belibasaki, S Kouimtzis
Apr 11, 2001·Small Ruminant Research : the Journal of the International Goat Association·S A. SalhabR Kassem
May 1, 1989·The British Veterinary Journal·M O MadaniB A Eluwhaishi
Jan 1, 1981·Theriogenology·D R NotterF S McClaugherty
Mar 7, 2014·Saudi Journal of Biological Sciences·Ahmed A Al-KawmaniMohammad Abul Farah
Feb 1, 1976·Genetical Research·A B Mafizul Islam, W G Hill
Jul 1, 1984·Journal of Dairy Science·R W Blake
Jul 2, 2020·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Richard GawneMichael Levin

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