Studies on the oestrus and ovarian activity during five successive oestrous cycles in gilts [pro-oestrus, cycle length, progesterone]
1980
Andersson, A.-M. | Einarsson, S. (Sveriges Lantbruksuniversitet, Uppsala. Dept. of Obstetrics and Gynaecology)
All gilts came in heat regularly during the whole period. Reddening and swelling of the vulva were observed during a significantly longer time in the first and second than in the subsequent pro-oestrous periods. The length of oestrus did not vary significantly in successive heats. The duration of the standing reflex was consistently shorter when the heat control was done in the absence of a boar. All gilts had low progesterone values before their first observed heat. The progesterone level in the blood during the five oestrous cycles studied varied in a cyclical pattern. The number of corpora lutea increased from heat 1 to 5.
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