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Article
Evaluating Glycerin Supplementation on Reproductive Performance of Sheep
Proceedings, Western Section, American Society of Animal Science (2011)
  • J.A. Walker, South Dakota State University
  • G.A. Perry, South Dakota State University
  • R. Salverson, South Dakota State University
  • P. Nester, South Dakota State University
  • C. S. Schauer, North Dakota State University--Fargo
  • J. E. Held, South Dakota State University
  • K. C. Olson, South Dakota State University
Abstract
This 3-year study evaluated the effect of
glycerin supplementation on ewe reproductive efficiency,
blood glucose and insulin concentrations. Mature Polypay
and Rambouillet ewes (n = 225) were orally dosed with
glycerin following estrus synchronization at rates of 0, 50,
100, 200 or 300 g/hd. In year 3 an additional 16 ewes were
supplemented (SUP) with 0.57 kg of range cake for 21 days
prior to breeding. Blood samples were collected (n = 25
ewes) for 10 hours post drenching. Blood was analyzed for
insulin and glucose concentrations. Ewes were exposed to
rams for 35 days. Pregnancy was determined by
ultrasonography evaluation. Number of lambs born per ewe
exposed was not different (P > 0.10) between treatments
(TRT) in year 1 and 2. Pregnancy rates were not different
(P = 0.55) by TRT in year 3. In yr 1, a TRT x time
interaction (P < 0.01) for insulin (ngml-1) concentrations
was observed, with 200 g glycerin having lower insulin
than 100 g glycerin. In yr 1, glucose exhibited a TRT x time
interaction (P < 0.01); 50 g glycerin had lower glucose
(mgdl-1) than 0 g glycerin and 200 g glycerin having lower
levels than 100 g glycerin. Glucose concentrations
exhibited a quadratic response with a peak at hr 1 and
returned to baseline by hr 7. In yr 2, insulin peaked at hr 4
and declined to hr 10. Glucose was higher (P < 0.05) for
200 and 300 g glycerin than 0, 50 and 100 g glycerin in yr
2. Glucose exhibited a quadratic response (P < 0.01) with a
peak at hr 2. Glucose increased linearly in year 3, (P < 0.01;
135.8, 176.44, 163.12, 175.12, 195.63, and 161.44 mgdl-1
for 0, 50, 100, 200, 300 g of glycerin and SUP,
respectively). Glucose had a quadratic response (P < 0.01);
glucose peaked at hr 1 and return to baseline by hr 7. In yr
3, insulin had a treatment by time interaction (P < 0.05);
insulin peaked at hr 2, 50 and 100 g glycerin returned to
baseline by hr 7; however, 200 and 300 g glycerin did not.
Insulin (P < 0.01) increased with increasing levels of
glycerin. Glycerin changed blood glucose and insulin
concentrations; however, it did not influence reproductive
performance.
Keywords
  • sheep,
  • glycerin
Publication Date
June, 2011
Publisher Statement
This was originally published in the Proceedings, Western Section of the American Society of Animal Science held from June 21-23, 2011 in Miles City, Montana.
Copyright © 2011 American Society of Animal Science
Citation Information
J.A. Walker, G.A. Perry, R. Salverson, P. Nester, et al.. "Evaluating Glycerin Supplementation on Reproductive Performance of Sheep" Proceedings, Western Section, American Society of Animal Science Vol. 62 (2011) p. 131 - 134
Available at: http://works.bepress.com/julie-walker/31/