Digestion in the pig between 7 and 35 d of age

1985

Self Cite

1. Forty pigs between 23 and 51 d of age were given ad lib. diets containing wheat and one of five protein concentrates: meat meal A, meat meal B, soya-bean meal, milk and lupins (Lupinus augustifolius). Twenty of these pigs were given indigestible markers from 51 to 56 d of age and were killed at 56 d of age.2. The diets containing meat meals A and B, soya-bean meal and milk contained 2.3 g total methionine/kg and the diet containing lupins contained 2.1 g/kg.3. A further forty pigs of the same age were given the same diets supplemented with 1 g synthetic methionine/kg. 4. The weight gains and feed conversion ratios of the pigs given the diets containing 2.1-2.3 g methionine and 3.1-3.3 g methionine/kg were not significantly different.5. The weight gains of the pigs given lupins (2.1 g methionine/kg) were less than those of the pigs given the diets containing 2.3 g methionine/kg.6. The apparent digestibility of dry matter (DM) and nitrogen was less for the diets containing the meat meals (0.75 and 0.78 respectively) than for those containing the other protein concentrates (0.80 and 0.84).7. The retention times in the large intestine of the diets containing soya-bean meal and lupins were 965 and 1083 min which were greater than those of the diets containing the other protein concentrates, mean 732 min.8. The major site of N digestion and absorption for the diet containing milk was the area of the small intestine 25-50% of total length from the pylorus, while for the other protein concentrates the major site was 5&75% of its total length from the pylorus.9. The digestion and absorption of N in the large intestine was less (3.4%) for the diet containing milk than for those containing the other protein concentrates (7.5-1 1.3%).10. The apparent digestibility of the methionine to the ileum for the five diets ranged from 0.74 to 0.86 while the calculated retention of the apparently-absorbed methionine was 1.00. It was suggested that methionine digestibility could be used as an indicator of availability.11. The calculated retention of apparently absorbed N in the carcass was 0.71 for the pigs given the diet containing milk and 0.51-0.58 for the pigs given the other diets.

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

The digestion of protein in young pigs and the utilization of dietary methionine

1985

Self Cite

“…Again, the reverse situation was observed with arginine. The apparent digestion of amino acids to the ileum differed from that of total N (Wilson & Leibholz, 1981~). For pigs given the milk-protein diet, the ileal digestibility of N was 0.80 and the apparent digestibility of amino acids ranged from 0-80 for glycine to 0.91 for methionine.…”

Section: Apparent and True Digestion Of Amino Acidmentioning

confidence: 96%

“…There were eight replicates of one pig per replicate. The composition of the diets is given in Wilson & Leibholz (1981 a). Twelve pigs were fed the diets ad lib.…”

Section: R H W I L S O N and Jane Leibholzmentioning

confidence: 99%

Digestion in the pig between 7 and 35 d of age

Wilson

1981

Self Cite

1.In two experiments, forty-four pigs weaned at 4-5 d of age were given diets containing milk or soya-bean proteins until slaughtered at 14,28 or 35 d of age.2. Additions of methionine and methionine plus lysine to the diets did not increase the proportions of these amino acids in ileal digesta.3. In the pigs given a nitrogen-free diet, ileal digesta contained more threonine, proline and glycine than in pigs given diets containing protein.4. The apparent and true digestibility of amino acids were greater when milk protein was fed than when soya-bean proteins were fed. 5.The apparent digestion of amino acids to the ileum of pigs given isolated soya-bean protein (ISP; Supro 610) increased with increasing age of pigs from a mean of 0.82 at 14 d of age to 0.87 at 35 d of age.6. When milk protein was fed apparent digestibilities of methionine and lysine to the ileum were 0.912 and 0.905. The apparent digestibility of threonine to the ileum was 0.800, 0.774 and 0.504 for pigs given the milk-, ISP and soya-bean-meal (SBM)-protein diets respectively. 7.Apparent digestibilities of total essential and non-essenlial amino acids were 0-79 and 0.69 respectively, and true digestibilities of both were 0.82.

“…Artificial rearing of pigs from 2 d of age has been successful using liquid milk diets (Braude et al 1970). However, it has been demonstrated (Wilson & Leibholz, 1979) that growth rates of 250 g/d can be achieved by pigs from 7-28 d of age given dry pelleted diets in which the source of dietary protein was milk.…”

mentioning

confidence: 99%

Digestion in the pig between 7 and 35 d of age

Wilson

1981

Self Cite

1. One hundred and fourteen pigs between 7 and 35d of age were given diets containing milk or soya-bean proteins in four separate experiments.2. The substitution of milk protein by soya-bean meal (SBM) to 75% of the total dietary protein reduced the weight gains and food conversion efficiencies of the pigs by 85% between 7 and 14 d of age and 31 % between 21 and 28 d of age.3. The treatment of soya-bean protein with alkali did not improve the performance of the pigs.4. The substitution of milk protein by two different isolated soya-bean proteins (ISP) resulted in weight gains of 34 and 60% of the gains of pigs given milk protein diets. 5.Supplementation of the soya-bean-protein diets with methionine to 13.7 g/kg (5 g/16 g nitrogen) resulted in reduced food intakes and weight gains of the pigs afid a 20-fald increase in the concentration of methionine in the blood plasma.6. Supplementation of soya-bean-protein diets with lysine to 22g/kg (8g/16gN) in addition to methionine doubled the concentration of lysine in the blood plasma.7. The apparent digestibility (AD) of dry matter (DM) and N of the diets containing soya-bean protein increased with increasing age of the pigs, but the AD of the milk-protein diet was not affected by the age of the pigs. The retention of N as a percentage of the N intake increased from 5767% for soya-bean protein over the duration of the experiments while the average value for the milk-fed pigs was 85% at all ages.8. At 35d of age, the fat content of the carcasses of the pigs given the ISP diet was 249g/kg DH compared to 164gFg DM for the pigs given the milk diets.