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Effects of supplementing rumen-protected rubber seed oil to dairy cattle on feed digestibility and milk production |
Pongsatorn Gunun1 
, Norakamol Laorodphan2
, Warachit Phayom3
, Walailuck Kaewwongsa4
, Chatchai Kaewpila1
, Waroon Khota1
, Nirawan Gunun4,*
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1Department of Animal Science, Faculty of Natural Resources, Rajamangala University of Technology Isan, Sakon Nakhon 47160, Thailand
2Animal Science and Aquaculture Program, Faculty of Food and Agricultural Technology, Pibulsongkram Rajabhat University, Phitsanulok 65000, Thailand
3Energy Engineering, Faculty of Technology and Engineering, Udon Thani Rajabhat University, Udon Thani 41000, Thailand
4Department of Animal Science, Faculty of Technology and Engineering, Udon Thani Rajabhat University, Udon Thani 41000, Thailand |
Correspondence:
Nirawan Gunun, Tel: +66-8-2114-2041, Email: nirawan.gu@udru.ac.th
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Received: 30 April 2024 • Revised: 27 May 2024 • Accepted: 5 September 2024 |
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| Abstract |
Objective
The aim of this study was to determine the effect of rumen-protected rubber seed oil (RPRSO) supplementation on feed digestibility, milk yield, and milk composition in tropical dairy cows.
Methods
Twelve crossbred Holstien-Friesian dairy cows (75% Holstein-Friesian, 25% Thai native breed) with a mean body weight of 460±30 kg and 20±5 days in milk were randomly assigned to 1 of 3 treatments according to a completely randomized design. The treatments were as follows: a basal diet without rumen-protected fat (RPF) (control) or supplementation of rumen-protected palm oil (RPPO) at 300 g/h/d and RPRSO at 300 g/h/d. Each cow was fed a total mixed ration ad libitum.
Results
The nutrient intake was similar among treatments (p>0.05). Adding RPF did not affect nutrient digestibility, while organic matter (OM) digestibility increased in dairy cows receiving RPRSO (p<0.01). Blood urea nitrogen (BUN), total protein, or glucose did not alter among treatments (p>0.05), while triglycerides and cholesterol were increased when cows were fed RPPO (p<0.01). Adding RPF increases milk yield in cows (p<0.01). The supplementation of RPRSO increased milk fat (p = 0.04). Milk fat yield was higher in RPPO and highest in RPRSO (p<0.01). The addition of RPF increased the oleic acid (OA, C18:1 cis-9) in milk (p = 0.01). In addition, cows fed RPRSO increased linoleic acid (LA; C18:2ω6 cis-9,12+trans-9,12) and α-linolenic acid (ALA; C18-3ω3 cis-9,12,15) in milk (p<0.01). The addition of RPF increased milk unsaturated fatty acids and monounsaturated fatty acids (p≤0.04). The polyunsaturated fatty acid (PUFA) in milk increased with RPRSO supplementation (p<0.01).
Conclusion
Supplementation of RPRSO during early lactation can increase feed digestibility and the concentration of milk fat with PUFA (LA and ALA) in tropical dairy cows. |
| Keywords:
Dairy Cows; Digestibility; Milk Composition; Milk Yield; Polyunsaturated Fatty Acids; Rumen-Protected Rubber Seed Oil |
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