1999, Number 2
Addition of supplemental dietary fat in substitution of forage in rations for lactating dairy cows: Nutrient digestibility and rumen function
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ABSTRACTFour lactating primiparous Holstein cows (529 kg) with "T" cannulas in the rumen and proximal duodenum were used to evaluate the treatment effects on characteristics of ruminal and total tract digestion. Cows were fed total mixed diets containing an average of 42.5% alfalfa and 57.5% concentrate at an equal interval and twice daily. Treatments were: 1) no supplemental fat; 2) 4% yellow grease (YG) substituted for steam-flaked corn, and 3) 4% yellow grease substituted for alfalfa hay (DM basis). There were no treatment effects (P›0.10) on ruminal pH, or ruminal and postruminal digestion of N, organic matter (OM), and starch. Treatment 3 tended (18%; P›0.20) to decrease ruminal acid detergent fiber (ADF) digestion. Supplemental fat increased (P‹0.10) dietary digestible energy (DE) and ruminal scape of feed N, (P‹0.05) total tract OM digestion and molar proportion of propionate were decreased. DE (Mcal/kg) value for YG averaged 7.54 Mcal/kg when YG was substituted by corn and 6.62 Mcal/kg when YG was substituted by forage. It is concluded that supplemental fat may substitute for either forage or concentrate without negative effects on ruminal VFA molar proportions, or site and extent of OM, ADF, starch, N and lipid digestion. However, adding 4% of fat substituting forage tended to decrease 12% DE value of supplemental fat.
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