Heifer development systems: A comparison of grazing winter range or corn residue

D. M. Larson, A. S. Cupp, R. N. Funston

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Two experiments at 2 Nebraska locations evaluated effects of heifer development system on growth and pregnancy rate. In Exp. 1, heifers (n = 270, BW = 225 ± 2 kg) grazed winter Sandhills range (WR) or west central Nebraska corn residue (CR) with a supplement (0.45 kg/animal; 31% CP; 80 mg·animal-1·d-1 of monensin). In Exp. 2, heifers (n = 180, BW = 262 ± 3 kg) grazed eastern Nebraska WR or CR with a supplement (0.45 to 0.90 kg/d; 31% CP; 80 to 160 mg·animal-1·d-1 of monensin). The CR heifers tended to have less (P = 0.10) ADG compared with WR heifers before breeding in Exp. 1; however, prebreeding ADG was similar (P = 0.77) in Exp. 2. Prebreeding BW, percentage of mature BW at breeding, and pregnancy determination BW were similar (P = 0.14) for CR and WR in both experiments. Percentage of heifers pubertal at breeding, AI conception, and AI pregnancy rate (Exp. 2) and final pregnancy rate in both experiments were also similar (P = 0.27) for CR and WR heifers. Precalving BW, percentage of calves born in the first 21 d, calf birth date, calf birth BW, and dystocia score were all similar (P = 0.21) for CR and WR heifers in both experiments. Cow BW at weaning, calf weaning BW, adjusted 205-d calf BW, and second season pregnancy rates were not affected (P = 0.16) by treatment. Heifer development system did not affect (P = 0.56) the cost of producing 1 pregnant heifer in Exp. 1 or 2. Development on CR may reduce ADG before breeding, but did not affect pregnancy rate. Heifer development using CR or WR postweaning resulted in similar reproductive performance and development cost.

Original languageEnglish (US)
Pages (from-to)2365-2372
Number of pages8
JournalJournal of animal science
Volume89
Issue number8
DOIs
StatePublished - Aug 1 2011

Fingerprint

Zea mays
heifers
grazing
Pregnancy Rate
corn
winter
pregnancy rate
Breeding
calves
Monensin
Weaning
monensin
breeding
Parturition
Dystocia
Costs and Cost Analysis
weaning
dystocia
Pregnancy
reproductive performance

Keywords

  • Heifer development
  • Supplement
  • Winter grazing system

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Heifer development systems : A comparison of grazing winter range or corn residue. / Larson, D. M.; Cupp, A. S.; Funston, R. N.

In: Journal of animal science, Vol. 89, No. 8, 01.08.2011, p. 2365-2372.

Research output: Contribution to journalArticle

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