Methionine supplementation of practical broiler rations

Bornstein, S.; Lipstein, Bianka

doi:10.1080/00071666408415529

Cited by 8 publications

(1 citation statement)

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“…Higher Met values (in terms of performance parameters) have proven beneficial in numerous studies [23,62]. Already decades ago, e.g., a study in 1964 [63] postulated that a supply of 0.63% Met (finisher diet) maximized the weight gains of the animals. In this previous study, neither the N excretion nor the health characteristics of the animals were taken into account.…”

Section: Discussionmentioning

confidence: 99%

Influence of Different Methionine Sources on Performance and Slaughter Characteristics of Broilers

Ullrich

Langeheine

Brehm

et al. 2019

Animals

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Simple SummaryThe increasing public demand for efficient, sustainably produced poultry meat with simultaneous optimization of animal welfare is calling for amendments in meat production. A starting point to meet this demand consists of complete diets for broilers with reduced crude protein content, supplemented with higher amounts of crystalline amino acids. This ensures sufficient nutritional supply and decreased nitrogen excretion for environmental relief. To optimize the performance and health, despite the drastically reduced protein content (~17.5% finisher diet), the present study compared different methionine sources (methionine hydroxy analog, DL-methionine, and L-methionine) in slightly higher dosages than found in practice, in comparison to a diet meeting the methionine requirements using methionine hydroxy analog. Methionine is the first limiting amino acid and has a significant influence on the health and growth of the animals. The results of the feeding trial showed no differences concerning general health, ileal histology, and performance data of broilers before slaughter. However, the composition of the breast meat differed significantly (highest protein content and lowest fat content in the L-methionine group), and thus provides the impetus for further research.AbstractSustainably produced poultry meat with consideration of animal health poses a challenge for broiler production. Low protein diets with high amounts of synthetic amino acids (AAs) like methionine (Met) are the consequence. In a five-week feeding trial, 360 broilers (Ross 308) assigned to four feeding groups were offered protein-reduced complete diets (starter: 20% crude protein (CP); grower: 18.5% CP; finisher: 17.5% CP), supplemented with essential AAs. The “MHA” group received DL-2-hydroxy-4-(methylthio) butanoic acid (DL-HMTBA; trade name: MHA®), groups “L” and “DL” the respective Met source in equivalent concentrations each exceeding the nutritional recommendations. “R-MHA” (“R” for “reduced”) received the minimum required level (using MHA as Met source). Performance exceeded performance goals without differences between the groups. The average feed conversion ratio (FCR) amounted to 1.35. The carcass/body weight ratio of R-MHA was significantly lower (0.782) compared to DL (0.808) and L (0.809). Breast meat of R-MHA contained significantly more fat (144 g/kg dry matter (DM)) compared to L (104 g/kg DM) and significantly lower CP content (R-MHA: 838 g/kg DM; L: 875 g/kg DM). The results indicated possible improvement in slaughter yield by protein-reduced diets supplemented with L-Met, thus recommending further research focusing on the Met influence.

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Section: Discussionmentioning

confidence: 99%

Influence of Different Methionine Sources on Performance and Slaughter Characteristics of Broilers

Ullrich

Langeheine

Brehm

et al. 2019

Animals

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Poultry Nutrition in 1964

Jensen

1965

World's Poultry Science Journal

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N REVIEWING poultry nutrition research published in 1964, one I cannot help but consider the question: Do we ever satisfactorily solve the problems in any area of nutrition? For example, calcium and phosphorus were recognized as critical nutrients in poultry rations from the very beginnings of organized poultry research. Yet, during 1964, over 10% of all papers reviewed dealt with some aspect of calcium or phosphorus nutrition.Undoubtebly, much of the work was prompted by the fact that we still have practical field problems with egg shell quality and occasional outbreaks of "cage fatigue" and rickets in commercial flocks.To indicate that general solution to problems in an area of poultry nutrition is eventually reached, very little research work in 1964 involved the B-complex vitamins. Obviously, sufficient information is now available on metabolism and requirement of these nutrients so that field or laboratory problems are not being encountered. Furthermore, the biochemical function of B-complex vitamins has been generally elucidated.In addition to work on calcium and phosphorus, many papers dealing with other minerals were published. In fact, more than 25% of all papers were on minerals. Protein, amino acids, and energy nutrition continued to receive attention. Research on cholesterol and other lipids in relation to poultry, appear to be receiving increased emphasis.

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