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Variables associated with peripartum traits in dairy cows. IX. Relationship of season and other factors to blood plasma concentrations of progesterone and the estrogens



Variables associated with peripartum traits in dairy cows. IX. Relationship of season and other factors to blood plasma concentrations of progesterone and the estrogens



Journal of Animal Science 54(2): 302-308



Least-squares associations of month, av. daily temp., photoperiod (h daylight/24 h) and other factors with plasma concentrations of hormones during the prepartum period were examined in 172 Holstein-Friesian cows and heifers. The data were summarised and expressed as values for days 7, 4 and 1 prepartum, which represented the means for days 8 to 6, 5 to 3, and 2 to 0 resp. All animals calved during a period of 19 consecutive months.

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Accession: 001030246

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PMID: 7076592


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