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SF_6 tracer method for the determination of the energy metabolism of Holstein cows

Author: YangZhanShan
Tutor: YangWeiRen；SuPengCheng
School: Shandong Agricultural University
Course: Animal Nutrition and Feed Science
Keywords: SF6 tracer method Holstein cows Energy metabolism Monensin
CLC: S823.9
Type: Master's thesis
Year: 2010
Downloads: 68
Quote: 0
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Abstract


In this study, SF 6 tracer method for the determination of the methane production of Holstein cows bred and carbon dioxide production, combined with the carbon balance, nitrogen balance and energy balance calculation of heat production, and with the breath test measured thermal chamber method compared to the value, verify SF 6 tracer method for the determination of the feasibility of energy metabolism in dairy cows. Trial also use SF 6 tracer method for the determination of monensin on Holstein cows energy metabolism. To this end, the following two tests. Test an established SF 6 labeling method Holstein bred heifers heat production methods. Test selection of 4 in good body condition, similar weight (350 ± 40) kg of 15-18 month old Holstein cows bred animals as a test, the test using 4 × 4 Latin square design, according to the different feeding levels are divided into four treatment, respectively, meet the test cattle weight gain 700 g / d, 500 g / d, 300 g / d and 0 g / d of nutritional needs, while taking advantage of respiration calorimetry chamber method and the SF 6 tracer method Holstein cows measured methane production, carbon dioxide production and heat production. The results showed that: ① SF 6 Tracing Method for Measuring methane production and respiration calorimeter chamber measurement results are not significantly different (P gt; 0.05), while maintaining the level of conditions, SF 6 tracer method for the determination of carbon dioxide production, heat production and respiration calorimeter chamber measurement results significantly different (P lt; 0.05), in the non-standard conditions can be maintained with SF 6 labeling method Holstein cattle bred energy metabolism. ② different feeding levels on methane production and heat production was significantly affected (P lt; 0.05), with increasing levels of feeding, heat production showed a significant increase (P lt; 0.05). ③ different feeding levels on the apparent metabolizable energy deposition rate and the deposition rate of apparent consumption can be significantly affected (P lt; 0.05), with the feeding level, the apparent metabolizable energy deposition rate and the deposition rate of apparent consumption can be significantly increased (P lt; 0.05). ④ different feeding levels on the apparent digestion of nitrogen deposition rate and the deposition rate of the apparent consumption of nitrogen significantly affected (P lt; 0.05), with increasing levels of feeding, digestion and nitrogen deposition rate of apparent consumption of nitrogen and the apparent deposition rate increased. Test two use SF 6 tracer monensin Holstein cows energy metabolism. Select the normal growth and development, weight 650 ± 30 kg, milk yield close to 10 Holstein cows. Completely randomized design, divided into experimental and control groups of five cows. Test group added per cow per day 200 mg monensin in the control group did not add, the results showed that: ① adding monensin diets significantly improved Holstein cows milk production and milk energy (P lt; 0.05 ). ② adding monensin diets significantly reduced the Holstein cow methane and carbon dioxide production (P lt; 0.05). ③ adding monensin diets Holstein cows significantly improves the milk consumption can be converted into the energy efficiency (P lt; 0.05). The results showed: under certain conditions, can be used SF6 tracer method for the determination of the energy metabolism of Holstein cows.

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