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Some of Greenwillow's Cattle
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<blockquote data-quote="HerefordSire" data-source="post: 573417" data-attributes="member: 4437"><p>Metabolism</p><p>Zerbini et al. (1996a) found that in working cows, glucose is an important energy source for the muscles; it is also important during reproduction. Fatty acids were found to be important for the synthesis of milk fat as well as reproductive hormones. Non-esterified fatty acids (NEFAs) and ß-hydroxybutyrate were found to increase in working cows whereas glucose, magnesium and inorganic phosphorous decreased. </p><p></p><p><strong>Zerbini et al. (1996a) found a greater loss in body weight in working non-supplemented cows than in working supplemented ones</strong>. Glucose was decreased in non-supplemented cows, which stimulated the release of NEFAs from adipose tissue (150% increase in the plasma). Fatty acids were mobilised from the fat depots even in well-fed animals. This suggests that NEFAs are the principal fuel for the muscle tissue of working dairy cows. Reduction in NEFAs in poorly fed working cows explains the low conception rate. Energy restriction affects reproductive performance at the hypothalamic or pituitary level. This could be due to inhibition of gonadotropin-releasing hormone (GnRH). </p><p></p><p><a href="http://www.ilri.org/InfoServ/Webpub/Fulldocs/ImprovingCattle/Module3.htm" target="_blank">http://www.ilri.org/InfoServ/Webpub/Ful ... odule3.htm</a></p></blockquote><p></p>
[QUOTE="HerefordSire, post: 573417, member: 4437"] Metabolism Zerbini et al. (1996a) found that in working cows, glucose is an important energy source for the muscles; it is also important during reproduction. Fatty acids were found to be important for the synthesis of milk fat as well as reproductive hormones. Non-esterified fatty acids (NEFAs) and ß-hydroxybutyrate were found to increase in working cows whereas glucose, magnesium and inorganic phosphorous decreased. [b]Zerbini et al. (1996a) found a greater loss in body weight in working non-supplemented cows than in working supplemented ones[/b]. Glucose was decreased in non-supplemented cows, which stimulated the release of NEFAs from adipose tissue (150% increase in the plasma). Fatty acids were mobilised from the fat depots even in well-fed animals. This suggests that NEFAs are the principal fuel for the muscle tissue of working dairy cows. Reduction in NEFAs in poorly fed working cows explains the low conception rate. Energy restriction affects reproductive performance at the hypothalamic or pituitary level. This could be due to inhibition of gonadotropin-releasing hormone (GnRH). [url=http://www.ilri.org/InfoServ/Webpub/Fulldocs/ImprovingCattle/Module3.htm]http://www.ilri.org/InfoServ/Webpub/Ful ... odule3.htm[/url] [/QUOTE]
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