UWI - St. Augustine

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Browsing UWI - St. Augustine by Subject "Animal nutrition -- Trinidad and Tobago"

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    Combined yeast culture and enzymatically hydrolysed yeast has potential to improve ruminal ADF digestion and modify CP degradability dependent on substrate.
    (2024) Hughes, Martin
    Rationale: Live yeast cultures have been a popular additive in ruminant feeds to improve fermentation efficiency, rumen, and intestinal health. However, very little is known about inactive yeast culture and hydrolysable yeast cells on nutrient digestibility in ruminants. Objective: The objective of this study was to determine the effects of a combined yeast culture and enzymatically hydrolysed yeast (YC+EHY) on in vitro ruminal dry matter and nutrient digestibility of contrasting substrates. Materials and methods: The experiment was conducted in the Animal Nutrition laboratory in the Department of Food Production, University of the West Indies, St. Augustine campus between January to March 2023. Seven chemically contrasting substrates including leaves and petiole of forage plants (Trichanthera gigantea, Gliricidia sepium, Leucaena leucocephala and Brachiaria arrecta), agriculture by-products (soybean meal, rice hulls) and a commercial concentrate feed for dairy cattle were incubated in vitro with and without YC+EHY to determine dry matter (DM), crude protein (CP), neutral detergent fibre (NDF), and acid detergent fiber (ADF) digestibility after 24- and 48-hours incubation (ANKOM Technology, method no. 3). Most feedstuffs were collected at the University of the West Indies Field Station or commercial dairy farms in Trinidad & Tobago over a 2-week period. These feedstuffs are widely used to feed ruminant animals in tropical environments as either supplemental or basal feedstuffs. A second experiment evaluated in vitro CP degradability by incubating the same substrates for 0-, 2-, 4-, 8-, 16-, 24-, and 48-hours with and without YC+EHY.