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Feeding of rapeseed meal to monogastric animals. 4



Feeding of rapeseed meal to monogastric animals. 4



Archiv für Tierernahrung 24(4): 299-307



4. The test animals were, as before, boars of Improved Land breed, bodyweight 25 kg at the start of the tests, in 3 groups of 4; and inbred rats in groups of 14. All were fed on the same pelleted feeds with 20% extracted soya bean meal, or 20% extracted rapeseed meal, with barley and minerals. The rapeseed meal was, as before, untreated or incubated with a rape pulp containing myrosinase and washed. Amino acids (17) were estimated in the meals and in the wash water and the results are shown in Table 1. In the pig, the rate of secretion of thyroxine, the half-life of thyroxine in blood and protein-bound iodine (PBI) in blood were measured. To estimate triiodothyronine (T3) and thyroxine (T4) in blood in vitro methods with Resomat-T3 and Resomat-T4, as used in clinical medicine, were used, and the methods are recommended for use with animals as simpler than those commonly used, and successful. Total and free T4 were measured. The results are presented in 7 tables and discussed briefly.Washing with water had little effect on the amino acid composition of rapeseed meal; loss of glutamic acid was a little greater than of the others. Pigs on rapeseed, groups 2 and 3, put on only half as much weight in 44 days as those on soya, group 1, and used roughly twice as much feed for unit increase. Biological half-life of thyroxine rose from group 1 to group 3; serum T4 at day 21, in mu g/100 ml, fell from 12 to 7 to 6, and thyroxine secretion rate in mu g/day 10 kg weight from 910 to 563 to 352. At day 37 half-life showed little change, serum T4 was higher in groups 2 and 3, and thyroxine secretion rates were 1022, 845 and 600, higher in each group than at day 21. Table 4 shows total serum T4, T3-binding capacity of serum and T4-index at day 3, 15, 21, 37 and 44. A rise of binding capacity indicated a falling saturation of transport protein in the pigs on rapeseed, interpreted with low values for serum T4 and the T4-index as showing increasing failure of thyroid function.In rats the effects on weight gain, on serum T4 and T3-binding capacity of serum were similarly affected by rapeseed. The thyroids of the rats on rapeseed were heavier and there were more monoiodothyronine and more iodine and less diiodothyronine and less T3 + T4 than in the thyroids of those on soya meal.

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Accession: 043119785

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PMID: 4433241


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