Estrus Synchronization and Periconceptual Supplementation Affect the Profitability of a Replacement Heifer Enterprise 1 2: 1

Experiments evaluated estrus synchronization and periconceptual supplementation on pregnancy rate and calf production. Approximately one-half of heifers in 2 pastures (yr 1) or 4 pastures (yr 2) were injected with prostaglandin F2α (PGF; n=1,182) or not (NPGF; n=1,208) 5 d after fertile bulls were i...

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Veröffentlicht in:The Professional animal scientist 2010-10, Vol.26 (5), p.527
Hauptverfasser: Larson, D.M, Richardson, R.D, Ramsay, K.H, Funston, R.N
Format: Artikel
Sprache:eng
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Zusammenfassung:Experiments evaluated estrus synchronization and periconceptual supplementation on pregnancy rate and calf production. Approximately one-half of heifers in 2 pastures (yr 1) or 4 pastures (yr 2) were injected with prostaglandin F2α (PGF; n=1,182) or not (NPGF; n=1,208) 5 d after fertile bulls were introduced for 25 d. In yr 2, a total of 1,230 heifers were randomly assigned to 1 of 4 pastures; 2 received a supplement providing 100g/d of Ca propionate (1.4kg/d, 20% CP) 2 d before through 19 d after bull exposure and 2 did not in a 25-d breeding season. Pregnancy rate was reduced (P
ISSN:1080-7446
1525-318X
DOI:10.15232/S1080-7446(15)30641-0