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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

Effectiveness of norgestomet implants in suppressing ovulation and estrus in heifers varies with stage of estrous cycle when implanted  [2000]

Yavas, Y.; De Avila, D.M.; Reeves, J.J.;

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Suppression of ovulation and estrus for 63 d by a 24-mg norgestomet ear implant with a delivery rate of 160 microgram d-1 was evaluated in beef heifers. Ovulation was suppressed in 80% of heifers implanted on day 7 of the estrous cycle, 40% on day 10, 33% on day 13, 53% on day 16, and 67% on day 19 (P < 0.05 for day 7 vs. days 10, 13 and 16). The norgestomet implant was more effective in suppressing ovulation and estrus when inserted on day 7 of the estrous cycle rather than later in the cycle.

Publicación

Canadian journal of animal science

ISSN : 0008-3984