Influence of increased lipid content in diet in the form of treated rapeseed meal on the metabolism and milk yield of dairy cows in the first third of lactation
2006
Pechova, A.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu) E-mail:[email protected] | Dvorak, R.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu) | Drastich, P.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu) | Lubojacka, V.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu) | Pavlata, L.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu) | Poul, J.(Zemedelsko-obchodni Druzstvo, Zichlinek (Czech Republic))
Twenty-eight dairy cows were divided into experimental (E) and control groups (C) and monitored within the first 100 days of lactation. The diet of both groups differed in lipid concentration (3.7% of dry matter in C vs 6.99% in E ). At the end of the first month, a higher degree of energetic metabolism disturbance as well as a higher occurrence of liver damage were determined in group E in comparison with group C. Concentrations of cholesterol, HDL-cholesterol and vitamin E increased during the experiment so that in the 3rd month, their values were almost double in E than in C cows. The proportion of HDL-cholesterol was lower and the total antioxidant status of blood serum was higher in E than in C animals. Milk protein concentration was significantly lower (3.18 vs. 3.45%) and milk fat concentration insignificantly higher (3.55 vs. 3.21%) in E than in C cows. Feeding of high doses of lipid during the first month after parturition led to the risk of a fatty liver, but no negative impact on the health was demonstrated during the peak period of lactation.
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