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Tropentag, September 14 - 16, 2022, Prague

"Can agroecological farming feed the world? Farmers' and academia's views."


The effects of feeding different levels of monensin on feed intake, milk production and composition and plasma metabolites of lactating Holstein dairy cows

Taimour Tanha, Mokhtar Fathi, Gholami Mehdi, Ghoryshi Mohamad

Payame Noor University, Dept. of Agriculture, Iran


Abstract


The objective of this study was to determine the effects of feeding different levels of monensin on feed intake, milk production and composition, milk fatty acid profile, nutrients digestibility and plasma metabolites of lactating dairy cows. Four multiparous Holstein cows averaging 530 ± 50 kg of body weight and 95 ± 19.8 days in milk were housed individually in a tie-stall facility. The study was conducted as a 4 × 4 Latin square design with four 21-d experimental period. Cows were offered four dietary treatments (150, 250, 350 or 450 mg of monensin/kg of DM) as total mixed ration twice daily. Dry matter intake did not affected by monensin (P > 0.05). Monensin supplementation (especially 10 or 20 mg/kg of DM) significantly increased milk yield and %4 fat corrected milk (P < 0.05). Milk fat and protein percentages or yields were not affected by monensin supplementation (P > 0.05). monensin reduced the percentage of the short-chain and saturated fatty acids in milk fat, but had no effect on the percentages of medium and long-chain fatty acids. Monensin supplementation increased unsaturated fatty acids concentrations in milk fat. Experimental diets had no effect on plasma total cholesterol, HDL-Cholesterol and LDL-Cholesterol concentration (P > 0.05), But, plasma glucose concentration was increased by monensin supplementation (especially at 250 or 450 mg/kg of DM) (P < 0.05). Based on the results of this study, feeding monensin at 250 or 350 mg/kg of DM was effective in inhibiting the biohydrogenation of unsaturated fatty acids in the rumen, and consequently in increasing the percentage of unsaturated fatty acids in milk fat, thus enhancing the nutritional properties of milk with regard to human health.


Keywords: Milk fatty acid composition, monensin, whole cottonseed


Contact Address: Taimour Tanha, Payame Noor University, Dept. of Agriculture, The West of Shaid Bagheri, Tehran, Iran, e-mail: tanha1351@yahoo.com


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