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

Leibholz, Jane

doi:10.1079/bjn19850018

Cited by 20 publications

(19 citation statements)

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“…The retention values for ileal digestible methionine in the current experiment (0.394364) are also much lower than the estimated values reported by Leibholz (1985) (0.97-1.07). Leibholz (l985), however, calculated retention using estimated values for methionine concentration from previous experiments where the pigs appeared to have been given largely methionine-adequate diets.…”

Section: Discussioncontrasting

confidence: 48%

“…Leibholz (1985) reported that the estimated retention of ileal digestible methionine by weaner pigs fed on five diets ranged from 0.97 to 1.07 and suggested that the ileal digestibility assay could be used to estimate methionine availability. If this is the case then amino acids may vary in their susceptibility to processing damage and methionine may be less susceptible than lysine and threonine.…”

Section: Ileal Digestibility: Methionine: Pigsmentioning

confidence: 99%

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Utilization of ileal digestible amino acids by growing pigs: methionine

1993

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An experiment was conducted to determine the utilization of ileal digestible methionine by growing pigs. Three methionine-deficient diets (0.09 g ileal digestible methionine/MJ digestible energy (DE)) were formulated using cottonseed meal, meat-and-bone meal and soya-bean meal respectively as the only source of methionine in the diet. An additional three diets were formulated with supplements of methionine to confirm that methionine was limiting in the first three diets. The growth performance and retention of methionine by pigs given the six diets over the 20-45 kg growth phase was then determined. Growth rates (g/d) of pigs given the three diets formulated to 0.09 g ileal digestible methionine/MJ DE were significantly different (P < 0.01): cottonseed meal 411, meat-and-bone meal 442, soya-bean meal 496 (SED 24.6). The response of pigs to the addition of methionine confirmed that methionine was limiting in these diets. Crude protein (N x 6.25) deposited by the pigs (g/d) was significantly higher (P < 0.05) for those given soya-bean meal (61) and meat-and-bone meal (57) relative to cottonseed meal ( 4 7 ; s~~ 3.3). The proportion of ileal digestible methionine retained by pigs given the three protein concentrates was: cottonseed meal 0.39, meat-and-bone meal 0.45, soya-bean meal 0.47 (SED 0.019). These results indicate that values for the ileal digestibility of methionine in protein concentrates do not reflect the proportion of methionine that can be utilized by the pig. It appears that, with heat-processed meals, a considerable proportion of the methionine is absorbed in a form@) that is (are) inefficiently utilized. Ileal digestibility: Methionine: PigsThe ileal digestibility of amino acids is commonly used to estimate the availability of amino acids for the growing pig. However, values for the ileal digestibility of lysine and threonine have been shown to be unsuitable for formulating diets containing heat-processed meal as a considerable portion of these amino acids appear to be absorbed in a form(s) that is (are) inefficiently utilized (Batterham et al. 1990a; Beech et al. 1991). It appears that ileal digestibility values for lysine and threonine overestimate availability in heat-damaged meals.Little is known about the relationship between ileal digestibility and availability of other essential amino acids. Leibholz (1985) reported that the estimated retention of ileal digestible methionine by weaner pigs fed on five diets ranged from 0.97 to 1.07 and suggested that the ileal digestibility assay could be used to estimate methionine availability. If this is the case then amino acids may vary in their susceptibility to processing damage and methionine may be less susceptible than lysine and threonine.The aim of the present experiment was to determine whether ileal digestibility values for E. S. B A T T E R H A M A N D O T H E R Smethionine were suitable for formulating diets, and to measure the retention of ileal digestible methionine from different protein concentrates by growing pigs.Protein concentrates T...

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Section: Discussioncontrasting

confidence: 48%

Section: Ileal Digestibility: Methionine: Pigsmentioning

confidence: 99%

Utilization of ileal digestible amino acids by growing pigs: methionine

1993

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“…The manufacturing 1985). Furthermore, there is evidence that the methods were the same for the two meals quantities of essential amino acids except that the hulls were not removed disappearing before the end of the ileum of during production of sunflower meal 1 pigs closely correlate with those available for whereas partial dehulling, using a percussionbody protein synthesis (Low and Partridge, type decorticator, was included during 1984;Just et ai, 1985;Leibholz, 1985; production of sunflower meal 2. Moughan and Smith, 1985).…”

Section: Microbial Synthesis and Degradation Of Amino Acids In The Lamentioning

confidence: 97%

Digestibilities of nitrogen and amino acids in soya-bean, sunflower, meat and rapeseed meals measured with pigs and poultry

Green¹,

Kiener²

1989

Anim. Prod.

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In order to determine the relative digestibilities of nitrogen and amino acids in foodstuffs for pigs and poultry, and the effects of manufacturing methods, equal quantities of soya-bean meal, sunflower meals [hulled (sunflower meal 1) and dehulled (sunflower meal 2)], meat meals [made with (meat meal 1), and without (meat meal 2), blood added at 250 g/kg meat tissue (wet weights)] and rapeseed meals [seeds heated at 80°C (rapeseed meal 1) or 100°C (rapeseed meal 2)] were mixed with protein-free ingredients. The diets were given to five growing pigs with ileo-rectal anastomoses, and, by crop-intubation, to 12 caecectomized and 12 intact cocks. Excreta were collected over 48-h periods. Endogenous excretion was estimated by giving protein-free diets.In the order, soya-bean meal, sunflower meals 1, and 2, meat meals 1, and 2, rapeseed meals 1, and 2, true digestibilities were: with pigs, of nitrogen, 0·81, 0·80, 0·79, 0·64, 0·79, 0·73, 0·70 (s.e.d. 0·030), of lysine, 0·84, 0·83, 0·84, 0·65, 0·84, 0·76, 0·72 (s.e.d. 0·032); with caecectomized birds, of nitrogen, 0·92, 0·91, 0·91, 0·66, 0·78, 0·74, 0·75 (s.e.d. 0·018), of lysine 0·92, 0·91, 0·93, 0·62, 0·79, 0·70, 0·70 (s.e.d. 0·020); with intact birds, values were similar to those with caecectomized birds for soya-bean, and the sunflower meals, but lesser for meat meals 1 and 2; the solubilities of nitrogen in pepsin were 0·96, 0·92, 0·93, 0·80, 0·89, 0·87, 0·87.Two hundred and eighty pigs (initial live weights 10 kg) were used to compare growth response to free lysine with that to lysine in soya-bean meal and sunflower meal 2. Lysine availabilities, assessed by analyses of regressions of live-weight gain against lysine intake were 0·82 (s.e. 0·12) for soya-bean meal, and 0·82 (s.e. 0·18) for sunflower meal 2.Amino acid digestibilities of the sunflower meals were similar to those of soya-bean meal, and were not influenced by dehulling; values for the rapeseed meals were lower, and unaffected by differences in heating severity; values for the meat meal were reduced by blood addition. Values differed between pigs and poultry, but there was consistency in the extent to which each species discriminated between some foodstuffs. The pepsin test was insensitive. The large standard errors associated with availability values prevented meaningful comparisons with digestibility values.

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“…A temperatura interna da sala manteve- Aumento no GPD de suínos na fase inicial de crescimento, em razão da suplementação de metionina + cistina digestível na ração, também foi observado por Leibholz (1984;1985).…”

Section: Resultsunclassified

Exigência de aminoácidos sulfurados digestíveis para suínos machos castrados mantidos em ambiente termoneutro dos 15 aos 30kg

Vaz

Oliveira

Donzele

et al. 2005

Arq. Bras. Med. Vet. Zootec.

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RESUMODeterminou-se a exigência de aminoácidos sulfurados para suínos machos castrados, mantidos em ambiente termoneutro, dos 15 aos 30kg. Utilizaram-se 70 leitões mestiços, distribuídos em delineamento experimental de blocos ao acaso, com cinco tratamentos (0,465; 0,511; 0,558; 0,605 e 0,652% de metionina + cistina digestível), sete repetições e dois animais por repetição. As rações experimentais e a água foram fornecidas à vontade. A temperatura no interior da sala foi mantida em 21,8±0,4ºC e a umidade relativa, em 73,8±4,9%. Os níveis de metionina + cistina digestível da dieta influenciaram de forma quadrática o ganho de peso diário, que aumentou até o nível de 0,596%, e a conversão alimentar, que reduziu até o nível de 0,627%. O consumo de ração dos animais não variou com os tratamentos. Os tratamentos influenciaram a deposição de proteína na carcaça, que aumentou de forma quadrática até o nível de 0,630%, enquanto a de gordura não variou. A exigência de aminoácidos sulfurados digestíveis para suínos machos castrados, mantidos em ambiente termoneutro, dos 15 aos 30 kg, é de 0,63%, correspondente à relação metionina + cistina digestível:lisina digestível de 67%, para máximo desempenho e composição de ganho.Palavras-chave: leitão, exigência, fase inicial de crescimento, metionina+cistina, termoneutralidade ABSTRACTThe requirements of digestible sulphurous aminoacids for swine barrows maintained in a thermoneutral environment from 15 to 30kg were estimated. Seventy crossbred barrows were allotted to a completely randomized block design with five treatments (0.465; 0.511; 0.558; 0.605; 0.652%

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

Cited by 20 publications

References 19 publications

Utilization of ileal digestible amino acids by growing pigs: methionine

Utilization of ileal digestible amino acids by growing pigs: methionine

Digestibilities of nitrogen and amino acids in soya-bean, sunflower, meat and rapeseed meals measured with pigs and poultry

Exigência de aminoácidos sulfurados digestíveis para suínos machos castrados mantidos em ambiente termoneutro dos 15 aos 30kg

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