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ARS Home » Plains Area » Miles City, Montana » Livestock and Range Research Laboratory » Research » Publications at this Location » Publication #101541
Title: MGA/PGF2ALPHA VS GNRH/PGF2ALPHA, A COMPARISON OF TWO ESTROUS SYNCHRONIZATION PROTOCOLS USING YEARLING BEEF HEIFERS

Author
item DOHERTY, D - COLORADO STATE UNIVERSITY
item WHITTIER, J - COLORADO STATE UNIVERSITY
item Geary, Thomas

Submitted to: Beef Research Report
Publication Type: Proceedings
Publication Acceptance Date: 4/1/1999
Publication Date: N/A
Citation: DOHERTY, D.R., WHITTIER, J.C., GEARY, T.W. MGA/PGF2ALPHA VS GNRH/PGF2ALPHA, A COMPARISON OF TWO ESTROUS SYNCHRONIZATION PROTOCOLS USING YEARLING BEEF HEIFERS. BEEF RESEARCH REPORT. COLORADO STATE UNIVERSITY. 1999. p. 75-78.

Interpretive Summary: Yearling heifers (n=124) were synchronized using either the MGA/PGF (n=60) or the Select Synch (n=64) protocol. Select Synch treated heifers showed a 26% greater heat response (P<.05) than did MGA/PGF treated heifers. The mass insemination conception rate for the MGA/PGF treated heifers was 36% greater than for the Select Synch treated heifers (P<.05). There was no difference between the groups when bred 12-hrs after first detected in heat (P>.05). Pregnancy rates did not differ between treatments (P>.05).

Technical Abstract: Yearling heifers (n=124) were synchronized using either the MGA/PGF (n=60) or the Select Synch (n=64) protocol. Select Synch treated heifers showed a 26% greater heat response (P<.05) than did MGA/PGF treated heifers. The mass insemination conception rate for the MGA/PGF treated heifers was 36% greater than for the Select Synch treated heifers (P<.05). There was no difference between the groups when bred 12-hrs after first detected in heat (P>.05). Pregnancy rates did not differ between treatments (P>.05).