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Reproductive activity in dairy cows post partum 1. the technique of palpation per rectum






Zimbabwe Journal of Agricultural Research 18(2): 65-70

Reproductive activity in dairy cows post partum 1. the technique of palpation per rectum

Palpations per rectum were carried out for over 100 days post partum in 415 Friesland dairy cows on 4 farms over 1 yr. Uterine involution occurred in 2 phases, the 1st being more rapid and marked than the 2nd. Estrus was noted when a cow was recorded as having been mounted. Two types of corpus luteum were identified-distinct and ill-defined. Where no estrus was shown, time of ovulation before the corpus luteum was 1st identified was on average taken to be 6.9 days .+-. 1.9 for distinct corpora lutea, and 8.6 days .+-. 2.9 for ill-denfined corpora lutea. Of ovulations, 62% occurred in the right ovary, and more distnct corpora lutea resulted than in the left ovary. Conception was not always accompanied by a palpable corpus luteum. An inherent rhythm was apparent even when neither ovulation nor estrus occurred in ovarian cycles. Very few persistent corpora lutea were identified and all were associated with disease, particularly uterine infection. Ovarian cysts were rare (4% of cows) and all regressed of their own accord; only 1 recurred within 100 days post partum. No adverse effects of twice-weekly palpations per rectum were apparent. Difficulties of interpertation of this technique are discussed.

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Accession: 006316134



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