Graduate Thesis Or Dissertation
 

The effect of feeding tallow, urea and protected tallow on in vivo nutrient digestion in sheep

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  • Five sheep digestion trials with four animals per treatment and three treatments per trial were conducted to determine if feeding protected tallow and/or protein would alter the deleterious effects of feeding urea and tallow together. Apparent digestibility coefficients, nitrogen retention and biological values were calculated. An additional trial was also conducted with five animals per treatment and four treatments per trial with a high level of roughage (47-50 percent ryegrass straw) and a moderate level of tallow (3 percent) with supplemental nitrogen being supplied by urea (control) soybean meal (SBM), Starea, or hydrolyzed feather meal. Higher dry matter (DM) digestibility, nitrogen retention and biological values resulted when feather meal and the SBM diets were compared to the Starea diet or the urea control. All diets were higher (P < .05) in fat digestion when compared with the urea control without tallow. Animals consuming diets of tallow and urea together resulted in lower (P < .05) digestibility of dry matter, ash, acid detergent fiber (ADF), digestible energy (DE), and crude protein (CP). When the tallow was protected from rumen microbial metabolism, nitrogen retention, DE and CP were improved (P < .05). Diets of protected tallow and protected tallow + protected protein showed increased (P < .05) fat digestibility over a control diet without fat. Negative nitrogen retention occurred when the protected tallow diet was fed. When urea was consumed at high levels (2.5 percent) + straw + tallow, the digestibility of DM, ash, and DE improved (P < .05) over a diet with low urea (1 percent) + alfalfa + tallow. The addition of protected tallow to the high urea diet resulted in an increase in DM and DE digestibility compared with the low urea + alfalfa + tallow diet. The protected tallow diet again resulted in lower (P > .05) nitrogen retention and biological value. When a commercially protected fat product (Alta Lipid) was compared to diets of urea + tallow or urea absorbed in the grain + tallow, digestibility differences were slight.
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