{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T16:42:51Z","timestamp":1788280971332,"version":"build-2803163510"},"reference-count":33,"publisher":"Asian Australasian Association of Animal Production Societies","issue":"4","license":[{"start":{"date-parts":[[2024,10,24]],"date-time":"2024-10-24T00:00:00Z","timestamp":1729728000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Science Research and Innovation Fund","award":["2565FF1TE1-AN2"],"award-info":[{"award-number":["2565FF1TE1-AN2"]}]}],"content-domain":{"domain":["animbiosci.org"],"crossmark-restriction":true},"short-container-title":["Anim Biosci"],"published-print":{"date-parts":[[2025,4,1]]},"abstract":"<jats:p>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\u00b130 kg and 20\u00b15 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&gt;0.05). Adding RPF did not affect nutrient digestibility, while organic matter (OM) digestibility increased in dairy cows receiving RPRSO (p&lt;0.01). Blood urea nitrogen (BUN), total protein, or glucose did not alter among treatments (p&gt;0.05), while triglycerides and cholesterol were increased when cows were fed RPPO (p&lt;0.01). Adding RPF increases milk yield in cows (p&lt;0.01). The supplementation of RPRSO increased milk fat (p = 0.04). Milk fat yield was higher in RPPO and highest in RPRSO (p&lt;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; C18:2\u03c96 cis-9,12+trans-9,12) and \u03b1-linolenic acid (ALA; C18-3\u03c93 cis-9,12,15) in milk (p&lt;0.01). The addition of RPF increased milk unsaturated fatty acids and monounsaturated fatty acids (p\u22640.04). The polyunsaturated fatty acid (PUFA) in milk increased with RPRSO supplementation (p&lt;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.<\/jats:p>","DOI":"10.5713\/ab.24.0287","type":"journal-article","created":{"date-parts":[[2024,10,24]],"date-time":"2024-10-24T06:37:27Z","timestamp":1729751847000},"page":"665-672","update-policy":"https:\/\/doi.org\/10.5713\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Effects of supplementing rumen-protected rubber seed oil to dairy cattle on feed digestibility and milk 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