Effects of level of feed intake on nitrogen, amino acid and energy digestibilities measured at the end of the small intestine and over the total digestive tract of growing pigs

Haydon, K.D.; Knabe, D.A.; Tanksley, T.D.

Journal of Animal Science 59(3): 717-724


ISSN/ISBN: 0021-8812
PMID: 6490552
DOI: 10.2527/jas1984.593717x
Accession: 001353336

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In a replicated trial of 3 x 3 Latin square design growing pigs (about 29 kg initially) were given freely (AL) or limit-fed (4.5 or 3% of body weight/day) on a 16% sorghum-soyabean diet. Limit-fed pigs were fed at 12-h intervals and water was limited to 2 litres/kg diet; AL pigs received water freely. Consumption by pigs fed freely averaged 6% of body weight daily. Neither feeding method nor level greatly affected nutrient digestibility measured at the end of the small intestine, but values tended to decrease as feeding level decreased. Comparisons of nutrient digestibility between AL and limit-fed pigs ranged from 2.9 to 0.7 percentage units, with only nitrogen (P <0.01) and methionine (P <0.05) reaching significance. Differences between 4.5 and 3% were slightly larger, ranging from 4.3 to 0.2 percentage units, with differences for DM, N, gross energy and several amino acids reaching significance (P <0.10 or P <0.05). Measured over the total tract, observed differences among feeding levels were again small, but the trend was reversed, with digestibilities increasing as feeding level decreased. The estimated percentage of ingested nutrients that disappeared in the large intestine increased as feeding level decreased. Most comparisons between AL and limited feeding, and between 4.5 and 3%, were significant (P <0.10 or P <0.05). Estimated daily losses of DM and gross energy in the large intestine decreased with decreasing feed intake, but losses of N and amino acids increased with decreasing feed intake.