The Effect of Pasture Nitrate Concentration and Concentrate Intake after Turnout on Embryo Growth and Viability in the Lactating Dairy Cow
In: Reproduction in Domestic Animals, Jg. 37 (2002-04-01), S. 111-115
Online
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Zugriff:
This study investigated the effects on embryo growth and survival rate of feeding heavily-fertilised spring grass, containing high levels of quickly-degradable nitrogen, to pregnant cows. Forty-eight lactating Holstein cows between 2 and 8 weeks pregnant were turned-out, after a one-week transition period onto high- or low-nitrate pasture and fed a high- or low-concentrate supplement. Cows grazing the High nitrate pasture had significantly higher milk and plasma urea concentrations than cows grazing the Control pasture, while cows which were fed less concentrate had a notably higher plasma ammonia. However, there was no evidence that an increased quickly-degradable nitrogen (QDN) intake from pasture affected embryo survival or growth from 20 days onwards. This suggests that the impact of turnout on fertility mainly affects ovulation, fertilisation and/or the early embryo.
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The Effect of Pasture Nitrate Concentration and Concentrate Intake after Turnout on Embryo Growth and Viability in the Lactating Dairy Cow
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Autor/in / Beteiligte Person: | Laven, Richard ; Biggadike, H. J. ; Allison, R. D. |
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Zeitschrift: | Reproduction in Domestic Animals, Jg. 37 (2002-04-01), S. 111-115 |
Veröffentlichung: | Wiley, 2002 |
Medientyp: | unknown |
ISSN: | 1439-0531 (print) ; 0936-6768 (print) |
DOI: | 10.1046/j.1439-0531.2002.00342.x |
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