Animal Sciences Masters Theses

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Browsing Animal Sciences Masters Theses by Author "Crane, Alison Ryan"

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    Impacts of Supplemental Arginine on Ewe Reproductive Performance
    (North Dakota State University, 2014) Crane, Alison Ryan
    The objective of this study was to determine the effects of injectable and oral arginine (Arg) supplementation provided 14 d post-breeding on reproductive performance of fall lambing ewes. Upon estrus detection (d 0) ewes were randomly assigned to one of six treatments for a 14-d treatment period: injectable saline (CON; n = 25), injectable alanine (IVALA; n = 20), injectable arginine (IVARG; n = 23), oral rumen-protected Arg (RPARG; n = 20), oral soybean meal (SBM; n = 23), or oral fishmeal (FM; n = 24). Weaning rates were higher (P < 0.05) in Arg supplemented ewes. Plasma progesterone and serum Arg concentrations exhibited a treatment and day effect (P < 0.05), but no treatment × day interaction was observed (P > 0.05). In contrast to previous research, supplemental Arg during the first 14 d of pregnancy did not improve pregnancy or lambing rates, however, IVARG positively impacted weaning rates.