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Article
Evaluation of Prior Grazing Experience on Reproductive Performance in Beef Heifers
The Professional American Scientist (2013)
  • G.A. Perry, South Dakota State University
  • B.L. Perry, South Dakota State University
  • Julie Walker, South Dakota State University
  • C.L. Wright, South Dakota State University
  • R.R. Salverson, South Dakota State University
  • H.H. Patterson, South Dakota State University
Abstract
An important part of any production system is the reproductive performance associated with replacement heifers. In the majority of beef operations, heifers are moved to a drylot for a period of time to be weaned and then must again be moved to a forage grazing situation. Therefore, experiments were conducted to determine whether previous grazing experience affected performance and conception rates. In Exp. 1, beef heifers were moved to a forage grazing situation after a 44-d weaning period in the drylot [EXPER (experienced); n=33] or were moved to a forage grazing situation 27 d before the start of the breeding season [NIV (naïve); n=32]. In Exp. 2, beef heifers were moved to a forage grazing situation before the breeding season (EXPER; n=207) or were moved to a forage grazing situation immediately following AI (NIV; n=214). In Exp. 1, after being moved, NIV heifers lost 1.6±0.08 kg/d for the first week they were turned to grass compared with EXPER heifers that gained 0.88±0.08 kg/d (P<0.0001). This resulted in a linear (P<0.01) BW gain among EXPER heifers and a quadratic (P=0.04) BW gain among NIV heifers. In Exp. 2, EXPER heifers had increased ADG (P<0.01; 0.58±0.03 kg/d) from AI to pregnancy diagnosis and more (P=0.04) became pregnant to AI (59.4%) compared with NIV heifers (0.21±0.03 kg/d and 49.1%). In summary, transitioning naive heifers to pasture resulted in BW loss during the first week after movement, and if this transition occurred immediately following AI, pregnancy success to AI was reduced.
Keywords
  • heifer development,
  • conception rate
Disciplines
Publication Date
December, 2013
DOI
10.15232/S1080-7446(15)30290-4
Citation Information
G.A. Perry, B.L. Perry, Julie Walker, C.L. Wright, et al.. "Evaluation of Prior Grazing Experience on Reproductive Performance in Beef Heifers" The Professional American Scientist Vol. 29 Iss. 6 (2013) p. 595 - 600
Available at: http://works.bepress.com/julie-walker/22/