Dairy cattle ration integration with rumen-protected pantothenic acid. Effects on milk production and reproductive efficiency
2000
Bonomi, A. (Parma Univ. (Italy). Istituto di Zootecnia, Alimentazione e Nutrizione)
The Author has integrated the ration of dairy cows, during the first 5 months of lactation, with pantothenic acid, protected by microincapsulation with fatty acid film or not protected at the doses of 50 mg, 100 mg and 200 mg of active substance/head/day. Protected pantothenic acid, regardless to the doses, and not protected pantothenic acid at the dose of 200 mg have improved the health status of the herd (reduction by 60% of most frequent diseases), fecundity ( resp. 1.70, -1.60; 1.47; 2.10 services per conception vs 2.37; 2.30; 2.50; 2.50 of controls), milk production (resp. 5.60%; 9.50%; 10.00%; 4.50%), milk fat (resp. 7.80; 6.70; 8.50; 4.50) and milk protein content (resp. 4.80%; 6.00%; 8.50%; 4.50%); no effect was shown on cheesemaking characteristics of milk. At the same doses protected or not protected pantothenic acid has caused changes in some blood parameters, with a rise of glucose, methionine, leucine, isoleucine and glutamic acid and a drop of acetate phenylalanine, glycine and histidine. Not protected pantothenic acid at lower doses (50 mg and 100 mg) was ineffective. On the basis of the results, the Author concludes that pantothenic acid daily requirement of high producing dairy cows can be met with rumen protected vitamin at the dose of 50 mg/head/day
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