The effects of partial replacing of dietary starch with saturated or essential unsaturated fatty acids on production performance, ruminal fermentation and blood parameters in lactating cows

Articles in Press

Document Type : Research Paper

Authors

Department of animal science- College of agriculture and natural resources- University of Tehran- Karaj - Iran

10.22059/ijas.2024.376868.654014

Abstract

In this study, 21 Holstein lactating cows were used in a completely randomized design with three diets included: 1. Diets supplemented with calcium salts of unsaturated fatty acids (1/9% of diet DM).2. Diet supplemented with saturated fatty acids mainly palmitic acid (1/9% of diet DM). 3. Carbohydrate diet (no fat supplementation). The study period was 45 days, 10 days for adaptation and 35 days for data collection. During this 35-day milk production and feed intake were recorded daily. Milk and feed samples were taken weekly. At the end of study period blood samples, rumen fluid and feces were collected. The results showed that milk fat percentage and feed efficiency increased use of supplements and treatments had significant effects. The blood urea nitrogen was increase in unsaturated fat supplements in compared to carbohydrate group but in saturated fat supplement was increased (p <0/05). Milk fatty acid profile showed that the amount of linoleic acid and linoleic acid significantly increased in unsaturated fat supplement group and palmitic acid significantly increased in saturated fat supplement group (p <0/05). Overall, supplementing calcium salts of unsaturated essential fatty acids can support same milk production and composition but improve milk fatty acids profile to improve the health of the consumer.

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Main Subjects

Iranian Journal of animal Science

Articles in Press, Accepted Manuscript
Available Online from 03 December 2024

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History

  • Receive Date: 30 May 2024
  • Revise Date: 28 October 2024
  • Accept Date: 29 October 2024

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