Interrelationships between ambient temperature, ...

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Paper title Interrelationships between ambient temperature, postpartum reproductive events and reproductive performance in dairy cows: a path analysis
Paper author(s) W. G. Etherington, S. W. Martin, Ian R. Dohoo, W. T. K. Bosu
Proceedings title Proceedings of the 13th World Congress on Diseases of Cattle, Durban, South Africa, September 17-21, 1984
Date 1984
Abstract A path analytic approach was used to study data collected on 23 traits of 226 Holstein-Friesians in a commercial dairy herd during May 1981-Oct. 1982. Rectal palpation to assess uterine involution and ovarian activity was performed at 15, 24 and 28 days post partum, and blood samples were collected for progesterone assay. The results indicated, that during winter, there was an increase in the incidence of retained placenta and a delay in postpartum uterine involution. Cows calving in winter had prolonged service periods compared with cows calving in summer. Cows calving in summer began to cycle earlier in the postpartum period than did winter calvers, as indicated by increased plasma progesterone concentrations on days 24 and 28 post partum. 45% of the variation in service period was accounted for by variation in the other traits. A diagram of paths and their coefficients is given..

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