אסיף מאגר המחקר החקלאי

Effect of changing the proportion, wheat: Sorghum in dairy cow rations on carbohydrate digestibility and NAN flow to the intestine

Year:

1996

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Volume :

57

Co-Authors:

Miron, J., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 20250, Israel
Solomon, R., Ministry of Agriculture, Extension Service, Hakirya, Tel Aviv, Israel
Bruckental, I., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 20250, Israel
Ben-Ghedalia, D., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 20250, Israel

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Abstract:

Five rumen-and abomasum-cannulated cows in mid-lactation were fed ad libitum, for two periods of 21 d each, two isonitrogenous (17% crude protein) total mixed rations (TMR) composed of 45% sorghum-wheat combination, 38% corn silage, 12% soybean meal, urea, buffers and minerals. The two TMRs differed in their sorghum (S): wheat (W) ratio, which was 70/30 in S and 30/70 in W treatments. Dry matter intake was 17.2 and 16.6 kg d-1 in S and W, respectively. Effect of treatments on the digestibility of carbohydrate constituents and N metabolism was examined. Neutral detergent fiber (NDF)-polysaccharides digestibility in stomachs and the entire gastrointestinal tract (GIT) was significantly higher in S than in W. The digestibility of neutral detergent soluble (NDS)-α-glucans was significantly higher in W than in S. More of NDS-α-glucans escaping ruminal fermentation was digested in the intestine of the S cows as compared with the W cows. The digestibility in entire GIT of total NDS-monosaccharide residues was 93% in W and 86% in S. Digestibility values of total carbohydrates in stomachs (49% and 52%) and entire GIT (79% and 80%) of S and W cows were similar. S and W cows were similar in rumen pH (6.15 and 6.13), rumen volatile fatty acids concentrations (133 and 136 mM) and rumen NH3 concentration (21 and 23 mg per 100 ml). Non-ammonia-N flow through the abomasum (410 and 403 g d-1) and N absorption in the intestine (67%) were also similar in S and W.

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