Efeito da linhagem, espaço na gaiola e nível de triptofano dietético no desempenho de poedeiras comerciais

Rech, Otávio Antonio; Pinheiro, João Waine; Fonseca, Nilva Aparecida Nicolao; Silva, Caio Abércio da; Oba, Alexandre

doi:10.5433/1679-0359.2010v31n4p1051

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Conversely, in all treatments where Ile was supplemented, hens showed similar performance and egg quality as layers that received diet supplementation with all three of the studied AA, indicating that Ile is a potentially limiting AA in low-CP diets for laying hens. This confirms the results found by other authors (SHIVAZAD et al, 2002;PEGANOVA;EDER, 2003;RECH et al, 2010).…”

Section: Resultssupporting

confidence: 83%

Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens

et al. 2015

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Section: Resultssupporting

confidence: 83%

Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens

et al. 2015

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“…These results are in agreement with previous trials, which also described no effect of rearing density on weight gain (PATTERSON; SIEGEL, 1998), body weight and flock uniformity (PAVAN et al, 2005) of pullets during the first weeks of life. On the contrary, Rech et al (2010) concluded that the reduction on floor space provided for birds significantly impairs weight gain. Differences in the values of floor space analyzed in each work could explain these discrepant results.…”

Section: Resultsmentioning

confidence: 99%

Performance and egg quality parameters of laying hens submitted to different rearing densities

Santo

Corrêa

Vieites

et al. 2017

SCA

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This study aimed to evaluate the effect of different rearing densities during brooding (0 to 2 weeks) and growth (3 to 15 weeks) on performance and egg quality of laying hens (Hy-line W-36) during production phase (18 to 42 weeks). In the brooding phase, a total of 3250 day-old chicks were allocated in wire cages, distributed in a completely randomized design composed of 5 treatments (63.57; 66.38; 69.44; 72.80 and 76.50 cm²/bird) with 10 replications each. At the beginning of the growth phase, floor space in each treatment was increased. Therefore, a total of 750 birds were selected from the original treatments, which represented 237.57, 265.52, 300.92, 347.22, and 410.35 cm²/bird. At the end of the growing phase, 390 pullets were transferred to production facilities and distributed, according to their original treatment, in conventional cages with 430.76 cm²/bird (13 birds/cage). For this phase, only 6 replications per treatment were adopted. Experimental data were subjected to analysis of variance and, in the case of significant differences, means were analyzed using polynomial regression test. Body weight, weight gain and uniformity were compared during the brooding and growth phases. First-egg weight, age at first egg, age at 50% daily production, weights of egg, albumen, yolk and shell, egg mass, yolk diameter, yolk height, yolk index, albumen height, percentages of shell, albumen and yolk, shell thickness, Haugh unit, and egg specific gravity were analyzed during the production stage. In conclusion, raising pullets on 63.57 cm2/bird (71 birds/cage) does not affect chicks’ performance during the brooding phase. However, for the growth phase, the recommendation is to provide 410.35 cm2/bird, which corresponded to 11 birds/cage in this research. For the production period, the recommendation is to utilize pullets raised on 265.52 cm2/bird, which corresponded to 17 birds/cage on this research.

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The importance of nutrition in alleviating high stocking density stress in poultry - A Review

Gül

Yıldız

Olgun

2022

Annals of Animal Science

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In recent decades, the number of birds reared per unit area has dramatically spiked to increase profitability in egg and meat production. However, nowadays, the increase in sensitivity to animal welfare and consumer demands brings along with it a raised interest in stocking density. Stocking density is defined either as the number of animals or body weight per unit area or as the area per animal. High stocking density, which is a stress factor, can be defined as an increase in the number of animals per unit area or a decrease in the area per animal. Stress caused by high stocking density negatively affects the bird’s physiology and performance as well as the quality of the product obtained. The ideal stocking density should be 9 laying hens, 35 kilogrammes for broilers, and 45 quails per square metre. Otherwise, one will observe stress indicators in birds reared in more than the recommended stocking density per unit area and, consequently, a decrease in bird growth, egg production, feed efficiency, and egg or meat quality. Apart from increasing the concentrations of amino acids such as lysine, methionine, tryptophan and arginine, minerals such as selenium and chromium, and vitamins such as C and E in the diet, the addition of additives such as probiotics, humates, phytophenol compounds, and propolis is also effective in reducing or eliminating these negative effects caused by high stocking density. As a result, regulations in the nutrition of animals are effective in reducing/preventing such negative effects, thus improving animal welfare and ensuring the maintenance of optimum yield.

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Efeito da linhagem, espaço na gaiola e nível de triptofano dietético no desempenho de poedeiras comerciais

Cited by 3 publications

References 5 publications

Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens

Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens

Performance and egg quality parameters of laying hens submitted to different rearing densities

The importance of nutrition in alleviating high stocking density stress in poultry - A Review

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