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- W1975843039 abstract "Abstract Holstein heifers were divided into three groups of 27 at least 60 days before any were inseminated to evaluate gross effects on ovarian activity when urea was fed continuously for more than 2 years. Groups were reduced to 21 heifers each before calving. In Groups 1, 2 and 3, respectively, urea nitrogen replaced 0, 22 and 45% of plant nitrogen in heifer rations from insemination to mid pregnancy, 0, 8 and 16% there-after until 2 weeks before calving, and 0, 18 and 36% precalving and during lactation. The rations were blended and fed free-choice. Dry matter in the lactation ration was 44% corn silage, 10% alfalfa bromegrass silage and 46% concentrate. Body weight increases were similar on each ration through second calving. Likewise, estrous cycles and intervals between inseminations were similar. After the second calving, groups were not different for time to first ovulation or for intervals between ovulations. In general, urea did not affect gross measures of ovarian activity. Effects of urea on abortion, retained fetal membranes, and conception efficiency were reviewed." @default.
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- W1975843039 date "1976-05-01" @default.
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- W1975843039 title "Dietary urea for dairy cattle III. Effect on ovarian activity" @default.
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- W1975843039 doi "https://doi.org/10.1016/0093-691x(76)90233-8" @default.
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