Effect of Nutrient Density on Performance, Egg Components, Egg Solids, Egg Quality, and Profits in Eight Commercial Leghorn Strains During Phase One

Wu, G.; Bryant, M. M.; Gunawardana, P.; Roland, D. A.

doi:10.1093/ps/86.4.691

Cited by 54 publications

(57 citation statements)

References 19 publications

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“…This may be explained by the higher feed intake of the birds fed higher energy levels, according to the experimental treatments. The results of the present experiment disagree with the findings of Grobas et al (1999), Wu et al (2007) and Valkonen et al (2008), who fed layers different dietary ME levels and observed an improvement (P<0.05) in feed conversion ratio as the dietary ME increased. On the other hand, Grobas et al (1999) and evaluated the effect of the intake of feeds containing different energy levels on the egg production of layers and concluded that feed conversion ratio was not influenced (P>0.05) by the dietary energy level; however, feed was offered ad libitum in these experiments.…”

Section: Resultscontrasting

confidence: 99%

“…There was no influence of the treatments on egg production (Table 5). Similar results were also obtained by , Wu et al (2007), Jalal et al (2007) and Costa et al (2009), who fed layers with different ME levels and concluded that the dietary energy level did not cause any significant effect (P>0.05) on egg production. However, Araújo & Peixoto (2005) observed instead a reduction in egg production (P<0.05) as the dietary energy level increased, whereas Valkonen et al (2008) obtained an increase in egg production with increasing dietary energy levels; however, the latter worked with energy levels lower than those used in the present study and those recommended in the literature (2345 to 2629 kcal ME/kg feed).…”

Section: Resultssupporting

confidence: 87%

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Metabolizable energy and oil intake in brown commercial layers

et al. 2012

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-With the objective to establish the best metabolizable energy (ME) intake for layers, and the best dietary vegetable oil addition level to optimize egg production, an experiment was carried out with 432 30-week-old Hisex Brown layers. Birds were distributed into nine treatments with six replicates of eight birds each according to a 3 × 3 factorial arrangement, consisting of three daily metabolizable energy intake (280, 300 or 320 kcal/bird/day) and three oil levels (0.00; 0.75 and 1.50 g/bird/day). Daily feed intake was limited to 115, 110 and 105 g/bird in order to obtain the desired energy and oil intake in each treatment. The following parameters were evaluated: initial weight, final weight, body weight change, egg production, egg mass, feed conversion ratio per dozen eggs and per egg mass and energy conversion. There was no influence of the treatments on egg production (%) or egg mass (g/bird/day). Final weight and body weight change were significantly affected by increasing energy intake. Feed conversion ratio per egg mass, feed conversion ratio per dozen eggs and energy conversion significantly worsened as a function of the increase in daily energy intake. An energy intake of 280 kcal/bird/day with no addition of dietary oil does not affect layer performance.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 87%

Metabolizable energy and oil intake in brown commercial layers

et al. 2012

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“…In other words, the lowest levels of GAA had not significant effects on EW, while the highest levels reduced it. EW is a parameter which affects by diets protein and amino acid level [32] and the arginine role is accepted as increaser the protein synthesis [33] . The mechanism of action is not known.…”

Section: Discussionmentioning

confidence: 99%

Mısır-Soya Küspesi Diyetine Eklenen Guanidino Asetik Asitin Yumurta Tavuklarının Üretim Performansı, Kan Biyokimyasal Parametreleri ve Üreme Hormonlarına Etkisi

Khakran¹,

Chamani²,

Foroudi³

et al. 2017

Kafkas Univ Vet Fak Derg

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Citation of This ArticleKhakran G, Chamani M, Foroudi F, Sadeghi AA, Afshar MA: Effect of guanidine acetic acid addition to corn-soybean meal based diets on productive performance, blood biochemical parameters and reproductive hormones of laying hens. Kafkas Univ Vet Fak Derg, 24 (1): 99-105, 201899-105, . DOI: 10.9775/kvfd.2017 AbstractThe present study was conducted to investigate the effects of GAA addition to corn-soybean meal based diets on productive performance, blood biochemical parameters and reproductive hormones of laying hens. Two hundred laying hens were used in a completely randomized design with 5 treatments and 4 replicates (n=10 birds). Birds received basal diets containing 0 (negative control), 0.057, 0.114 and 0.171% GAA/kg of diet. A diet containing 2% meat meal was also considered as positive control. The data for productive performance was recorded during 84 d and blood samples were collected to evaluate the blood biochemical parameters including triglycerides, high and low density lipoproteins, aspartate aminotransferase and alanine aminotransferase and nitric oxide and reproductive hormones (LH and FSH) at 42 and 84 d. Results showed that GAA addition to diet had not significant effects on productive performance but 0.171% GAA addition reduced egg weight (P<0.05) compared with control groups. Also, 0.114% GAA addition to diet increased levels of LH and FSH compared with control groups at 42 and 84 days. It can be concluded that GAA addition to diet is not appropriate strategy for improving performance of laying hens. Keywords: Creatine, Guanidine acetic acid, Laying hens, Nitric Oxide, Productive performance, Reproductive hormones Mısır-Soya Küspesi Diyetine Eklenen Guanidino Asetik Asitin Yumurta Tavuklarının Üretim Performansı, Kan Biyokimyasal Parametreleri ve Üreme Hormonlarına Etkisi ÖzetBu çalışma GAA'nın mısır soya fasulyesi ağırlıklı rasyonlara eklenmesinin üretim performansı, kan biyokimyasal parametreleri ve yumurta tavuklarının üreme hormonları üzerindeki etkilerini araştırmak amacıyla yürütülmüştür. Çalışma tamamen rastgele edilmiş bir tasarım ile 5 grup ve 4 alt grup (n = 10 tavuk) iki yüz yumurta tavuğu ile yürütülmüştür. Tavuklar 0 (negatif kontrol), 0.057, 0.114 ve %0.171 GAA/kg içeren bazal rasyon ile beslenmiştir. Ayrıca rasyonda %2 et unu içeren bir de pozitif kontrol grubu oluşturulmuştur. Üretim performans verileri 84 gün boyunca kaydedildi ve trigliseridler, yüksek ve düşük yoğunluklu lipoproteinler, aspartat aminotransferaz, alanin aminotransferaz, nitrik oksit ve üreme hormonları (LH ve FSH) başta olmak üzere kan biyokimyasal parametrelerini değerlendirmek için 42 ve 84. günlerde kan numuneleri alındı. Sonuç olarak GAA'nın tavuk rasyonuna ilave edilmesiyle, üretim performansı üzerinde anlamlı bir etkisinin olmadığı, %0.171 GAA katkısının kontrol grubuna kıyasla yumurta ağırlığını azalttığı (P<0.05) görüldü. Ayrıca, rasyonda %0.114 GAA ilavesi ile kontrol gruplarına kıyasla LH ve FSH düzeylerinde artış görülmüştür. GAA'nın rasyona eklenmesinin yumurta tavuklarınd...

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“…In both cases, however, the relative weight of the yolk was not changed. In an experiment with Leghorn hens, increased dietary levels of energy and amino acids signifi cantly increased egg weight (Wu et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Laying performance and nitrogen balance in hens fed organic diets with different energy and methionine levels

Koreleski

Świątkiewicz

2009

J. Anim. Feed Sci.

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In a model experiment, 72 Bovans brown hens from 24 to 53 weeks of age were allocated to 4 groups with 18 replicates. Each hen (replicate) was kept in an individual cage. Layers were fed basal organic diets with lower or higher metabolizable energy (ME N ) contents resulting from including 1% rape seed oil. The diets formulated according to organic limitations on feedstuff choices were either not supplemented or supplemented with 0.6 g·kg -1 DL-methionine (Met) to increase total dietary methionine and SAA levels to 2.94 g and 5.21 g·kg -1 , respectively. In the experiment, egg production, feed intake, feed conversion, egg quality parameters and nitrogen (N) balance indices were determined.Met supplementation of the diet had a positive effect on laying rate, feed intake and feed conversion (P<0.001). Egg and yolk weight were also increased by Met, but yolk contribution in egg was not changed. The higher energy level decreased daily feed intake, but had no effect on other performance parameters.The increased dietary energy level positively affected N retention measured as % of N intake (P<0.05). Adding Met increased daily N retention (P<0.05) and N retention as % of N intake (P<0.01) and decreased N content in excreta (P<0.05), but the differences in daily N excretion were not confi rmed statistically. Nevertheless, it could be calculated for the whole experimental period (350 days) that feeding the higher energy-and methionine-supplemented diet decreased N excretion in manure by 56 and 63 g N per hen.

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Effect of Nutrient Density on Performance, Egg Components, Egg Solids, Egg Quality, and Profits in Eight Commercial Leghorn Strains During Phase One

Cited by 54 publications

References 19 publications

Metabolizable energy and oil intake in brown commercial layers

Metabolizable energy and oil intake in brown commercial layers

Mısır-Soya Küspesi Diyetine Eklenen Guanidino Asetik Asitin Yumurta Tavuklarının Üretim Performansı, Kan Biyokimyasal Parametreleri ve Üreme Hormonlarına Etkisi

Laying performance and nitrogen balance in hens fed organic diets with different energy and methionine levels

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