The effect of adding lysine and methionine to the diet of pigs kept on low-protein vegetable foods

Evans, R. E.

doi:10.1017/s0021859600022449

Cited by 9 publications

(2 citation statements)

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“…The influence of lysine on daily 1963; ; Robinson, Morgan live-weight gain and feed conversion efficiency at a & . The interpretation of the results of constant crude protein level has been demonstrated many of these experiments is made difficult because in pigs up to 200 lb live weight by Ericson, Larson generally as the level of dietary crude protein & Ostholm (1962) and Evans (1960) Acker, Catron & Hays (1959); t Presentaddress: DepartmentofFarmManagement, McWard et al (1959); and Jones, Livingston & University of New England, Armidale, New South Livingstone (1963). The lack of agreement in the Wales, Australia.…”

Section: Introductionmentioning

confidence: 99%

Protein, lysine and feed intake level effects on pig growth: I. Main effects

et al. 1969

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SUMMARYA total of 512 pigs were given from 50 lb live weight one of 16 diets, i.e. with 4 lysine levels at each of 12, 14, 16 and 18% protein, at one of 4 levels of intake. They were killed at 100, 150, 200 or 250 lb live weight.Live-weight gain was not improved significantly by increasing the protein level above 16, 14, 12and 12%, respectively, for the 50–100, 100–150, 150–200and200–2501bstages. However, conversion of feed to live-weight gain was improved significantly during the 50–100 lb stage by increasing the protein to 18%. Gain in lean meat and in the efficiency of conversion of feed to lean meat were improved by increasing the above protein levels slightly.Live-weight gain was not improved significantly by increasing the lysine level above 1·04, 0·74, 0·70 and 0·59%, respectively, for the 50–100, 100–150, 150–200 and 200–250 lb stages. However, conversion of feed to live-weight gain was improved significantly during the 50–100 lb stage by increasing the lysine level to 1·22%. Raising the lysine level at each level of protein had no significant effect on the rate and efficiency of lean meat gain.Live-weight gain was significantly improved by increasing the level of feed intake almost to ad libitum levels for the 50–100, 100–150 and 150–200 lb stages. There was a suggestion of a similar effect in the 200–250 lb pigs although it was not statistically significant. Conversion of feed to live-weight gain was improved in the 50–100 lb pigs only by increasing the level of feed intake: in the older pigs increasing the level of feed intake caused a worsening in feed conversion ratio. Increasing the level of feed intake gave a significant improvement in rate of lean meat gain but a significant worsening in the efficiency of conversion of feed to lean meat during all stages up to 200 lb.Interaction effects of these factors and sex, on growth performance, are described.

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Section: Introductionmentioning

confidence: 99%

Protein, lysine and feed intake level effects on pig growth: I. Main effects

et al. 1969

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“…T h e importance of the lysine content of the diet is well established and there are many examples in the literature of the improvement in performance that can be brought about by lysine supplementation of diets containing poor-quality proteins (Evans, 1960;Jones, Hepburn, Cadenhead & Boyne, 1962;Rerat & Lougnon, 1965;Ostrowski, 1969). It has also been reported that small improvements in Performance can be obtained when lysine is added to diets containing white fish meal, the protein concentrate most commonly used in this country, but economic appraisal of the results showed that this was not a viable proposition at present prices (Braude & Lerman, 1970).…”

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The replacement of protein concentrates by synthetic lysine in the diet of growing pigs

Braude¹,

Mitchell²,

Myres³

et al. 1972

Br J Nutr

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I .Pigs from 20 to 60 kg live weight were fed on cereal diets, supplemented only with vitamins and minerals, with and without supplementary lysine.2. Growth rate, feed:gain ratio and carcass quality of pigs given a high-barley diet (75 barley meal, 23 % wheat offal) were inferior to those of pigs given a high-wheat offal diet (75 :h wheat offal, 23 yo barley meal).3. On both diets, but particularly on the high-barley diet, performance was improved by the addition of L-lysine (to give a total lysine content of 5.2 g/16 g nitrogen, approximating to that present in a standard barley meal-wheat offal diet supplemented with 7 % white fish meal).4. Percentage N retention was improved on both diets by supplementation with lysine.5. Results for carcass composition showed that the carcasses of pigs fed on the unsupplemented high-wheat offal diet contained more lean tissue than those of pigs given the unsupplemented high-barley diet. Lysine supplementation resulted in an increased content of lean tissue on both diets, the percentage increase due to lysine being greater (but not significantly so) on the high-barley diet. The increased lean content was reflected in the carcass measurements but not in the total N retention values, which did not differ significantly between treatments.6. The results are discussed in relation to the shortage and high cost of animal protein concentrates and the possible replacement of these concentrates with synthetic amino acids.

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