Effects of synchronizing starch and protein degradation in rumen on fermentation, nutrient utilization and total tract digestibility in sheep
2006
Biricik, H. | Turkmen, I.I. | Deniz, G. | Gulmez, B.H. | Gencoglu, H. | Bozan, B.
The effects of synchronizing the dietary starch and crude protein (CP) degradation in rumen on nutrient utilization, fermentation and total tract digestibility in sheep were investigated. Four diets were formulated with different rates of starch and CP release in rumen, but with similar metabolic energy, starch and CP. The diets were: slowly degradable starch, slowly degradable protein; slowly degradable starch, rapidly degradable protein; rapidly degradable starch, rapidly degradable protein; rapidly degradable starch, slowly degradable protein. Diets were fed to four cannulated sheep ad libitum in two equal portions, using a 4 x 4 Latin square design. DM intake was not influenced by either the rate of starch or protein degradation. There was no significant effect of dietary treatment on digestibility of DM, organic matter, starch, CP, neutral detergent fiber or acid detergent fiber in rumen and total tract. Rumen pH was greater for sheep fed slowly degradable starch diets than rapidly degradable starch (P0.05). Rumen total volatile fatty acid concentrations were not affected by treatments, but the molar proportions of propionic acid were higher for sheep fed rapidly degradable starch diets than slowly degradable starch diets (P0.05). The ratios of acetic acid (A) to propionic acid (P) were higher for sheep fed slowly degradable starch diets than rapidly degradable starch diets (P0.05). Rumen NH3-N concentrations were not affected by the degradability of protein. Rumen pH and A:P were higher in diets containing slowly degradable starch than in diets rapidly degradable starch. P was higher in diets containing rapidly degradable starch than in diets containing slowly degradable starch. Rumen fermentation and utilization of nutrients in the rumen affected starch degradability more than protein degradability. Synchronizing starch and protein degradation in rumen had no effect on intake and digestibility of nutrients in sheep
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