| THE EFFECT OF INCREASING AMOUNT OF GLUCOGENIC PRECURSORS ON REPRODUCTIVE PERFORMANCE IN YOUNG POSTPARTUM RANGE COWS. | |
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MedLine Citation:
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PMID: 21498654 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Supplementing CP and propionate salts (PS) may improve economic returns in young range beef cows by increasing the dietary supply of glucogenic precursors. A 3-yr study conducted at Corona Range and Livestock Research Center from February to mid-July in 2005 (n = 80), 2006 (n = 81), and 2007 (n = 80) evaluated days to first estrus, calf weaning weight, BW change, and metabolic responses in 2- and 3-yr-old postpartum cows grazing native range. Cows were individually fed 1 of 3, 36% CP supplement treatments after parturition with increasing glucogenic potential (GP) supplied by RUP and PS. Supplements were isoenergetic and fed at a rate of 908 g/(cow·d) twice weekly. Supplementation was initiated 7 d after calving and continued for an average of 95 d. Supplement treatments provided: (1) 328 g of CP, 110 g of RUP + 0 g PS (PS0); (2) 328 g of CP, 157 g of RUP + 40 g of PS (PS40); or (3) 329 g of CP, 158 g of RUP + 80 g of PS (PS80). Ultimately, PS0, PS40, and PS80 provided 44, 93, and 124 g of glucogenic potential (GP), respectively. Body weight was recorded weekly and serum was collected twice weekly for progesterone analysis to estimate days to first estrus. Cows were exposed to bulls for 60 d or less starting mid-May. Days to first estrus exhibited a quadratic (P = 0.06) response to GP resulting from the fewest days to first estrus with the consumption of PS40. Pregnancy rates were 88, 96, 94% for PS0, PS40, and PS80 fed cows, respectively (P = 0.11). Total kilograms of calf weaned per cow exposed to bulls for the supplementation and following year quadratically increased (P = 0.09). However, supplement did not affect milk composition or yield (P > 0.53). Serum acetate half-life decreased linearly (P = 0.08) with increasing GP in 2007. Predicted margins were the greatest (quadratic; P = 0.03) for cows fed PS40. Even though supplement costs were greater for PS40 and PS80, cows fed PS40 had increased profits ($33.47/cow) over feeding cows PS0 and PS80. This study implies that young postpartum cows fed additional glucogenic precursors may have improved reproductive efficiency and wean more calf weight per cow exposed to breeding. |
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Authors:
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J T Mulliniks; M E Kemp; S H Cox; D E Hawkins; A F Cibils; D M Vanleeuwen; M K Petersen |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-15 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal and Range Sciences, New Mexico State University, Las Cruces, NM, 88003. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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