Somkiat Saithanoo, Surasak Kochapakdee, Surapol Choldumrongkul, Apichart Lawpetchara, and Winai Pralomkarn

pp. 595 - 600

Abstract

The objectives of the study were to investigate the effects of genotype [Thai native (TN), 25%
Anglo-Nubian cross-bred (AN) and 50% AN], season of mating (dry season, moderate rainy season and
heavy rainy season) and year of mating (1992-1998) on proportion of does mated and incidence of oestrus during pregnancy. On average, 63.6% of does were mated within 14 days of buck introduction and the
proportion for TN, 25% AN and 50% AN does mated in this period were 67.5, 58.0 and 60.3%, respectively.
The proportions of does mated within 14 days in dry, moderate rainy and heavy rainy seasons were 61.2,
62.7 and 66.7%, respectively. In 1998, only 36.1% of does were mated within 14 days whereas 48.1% were
mated after 21 days of buck introduction. Moreover, 10.9% of does in this study showed signs of oestrus
during pregnancy and 48.1% occured within 7 days.