Behaviour, Growth Performance, Foot Pad Quality, Bone Density and Carcass Traits of Broiler Chickens Reared with Barrier Perches and fed Different Dietary Crude Protein Levels

2016 ◽  
Author(s):  
Clover Bench ◽  
Matt Oryschak ◽  
Doug R. Korver ◽  
Eduardo Beltranena
Keyword(s):  
Bone Density ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Crude Protein ◽  
Carcass Traits ◽  
Protein Levels ◽  
Dietary Crude Protein ◽  
Foot Pad

scholarly journals Protein and energy relationships in the broiler chicken

1993 ◽  
Vol 70 (3) ◽  
pp. 667-678 ◽  
Author(s):  
R. W. Rosebrough ◽  
J. P. McMurtry
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Broiler Chicken ◽  
Protein Levels ◽  
Low Protein ◽  
Dietary Crude Protein ◽  
Energy Relationships ◽  
Limiting Amino Acid ◽  
Limiting Amino Acids

Male broiler chickens growing from 7 to 35d were fed on a diet containing 150g crude protein (N × 6·25)/kg diet supplemented with lysine to equal that in diets containing 166, 183 and 200g crude protein/kg diet (Expt 1). A second group of male broiler chickens growing over the same period were fed on a diet containing 120g crude protein/kg supplemented with lysine, arginine, tryptophan, threonine and isoleucine equal to that in diets containing 144, 172 and 200g crude protein/kg diet (Expt 2). Growth was improved by lysine supplementation but not to the level attained by feeding 200g crude protein/kg (Expt 1). Lysine, arginine, tryptophan, threonine and isoleucine supplementation of a low-protein diet also improved growth, but growth again fell short of that attained by feeding a diet containing 200g crude protein/kg. Plasma insulin-like growth factor-1 and thyroxine concentrations increased and triiodothyronine decreased as the crude protein level increased from 150 to 200g/kg diet. Supplemental lysine did not affect plasma levels of these hormones. Although dietary crude protein levels noticeably changed rates ofin vitrolipogenesis, changing either the level of a single limiting amino acid or the levels of several limiting amino acids did not change lipogenesis.

scholarly journals Evaluation of dietary crude protein concentrations, fishmeal, and sorghum inclusions in broiler chickens offered wheat-based diet via Box-Behnken response surface design

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0260285
Author(s):  
Shemil P. Macelline ◽  
Peter V. Chrystal ◽  
Shiva Greenhalgh ◽  
Mehdi Toghyani ◽  
Peter H. Selle ◽  
...  
Keyword(s):  
Weight Gain ◽  
Amino Acid ◽  
Growth Performance ◽  
Feed Intake ◽  
Broiler Chickens ◽  
Crude Protein ◽  
Surface Design ◽  
Dietary Crude Protein ◽  
Nutrient Utilisation ◽  
Amino Acid Concentrations

The objective of this study was to investigate the impacts of dietary crude protein (CP), fishmeal and sorghum on nutrient utilisation, digestibility coefficients and disappearance rates of starch and protein, amino acid concentrations in systemic plasma and their relevance to growth performance of broiler chickens using the Box-Behnken response surface design. The design consisted of three factors at three levels including dietary CP (190, 210, 230 g/kg), fishmeal (0, 50, 100 g/kg), and sorghum (0, 150, 300 g/kg). A total of 390 male, off-sex Ross 308 chicks were offered experimental diets from 14 to 35 days post-hatch. Growth performance, nutrient utilisation, starch and protein digestibilities and plasma free amino acids were determined. Dietary CP had a negative linear impact on weight gain where the transition from 230 to 190 g/kg CP increased weight gain by 9.43% (1835 versus 2008 g/bird, P = 0.006). Moreover, dietary CP linearly depressed feed intake (r = -0.486. P < 0.001). Fishmeal inclusions had negative linear impacts on weight gain (r = -0.751, P < 0.001) and feed intake (r = -0.495, P < 0.001). There was an interaction between dietary CP and fishmeal for FCR. However, growth performance was not influenced by dietary inclusions of sorghum. Total plasma amino acid concentrations were negatively related to weight gain (r = -0.519, P < 0.0001). The dietary transition from 0 to 100 g/kg fishmeal increased total amino acid concentrations in systemic plasma by 35% (771 versus 1037 μg/mL, P < 0.001). It may be deduced that optimal weight gain (2157 g/bird), optimal feed intake (3330 g/bird) and minimal FCR (1.544) were found in birds offered 190 g/kg CP diets without fishmeal inclusion, irrespective of sorghum inclusions. Both fishmeal and sorghum inclusions did not alter protein and starch digestion rate in broiler chickens; however, moderate reductions in dietary CP could advantage broiler growth performance.

scholarly journals Crude protein and supplemental dietary tryptophan effects on growth and tissue neurotransmitterlevels in the broiler chicken

1996 ◽  
Vol 76 (1) ◽  
pp. 87-96 ◽  
Author(s):  
R.W Rosebrough
Keyword(s):  
Feed Intake ◽  
Broiler Chickens ◽  
Crude Protein ◽  
Broiler Chicken ◽  
Hplc Separation ◽  
Protein Levels ◽  
Dietary Crude Protein ◽  
Indian River ◽  
Indole 3 Acetic Acid ◽  
Different Levels

Indian River male broiler chickens growing from 7 to 28 d of age were fed on diets containing 120,210 and 300 g crude protein/kg diet and 0, 1–67 or 16·7 g added tryptophan (TRP)/kg diet. The hypothesis tested was that crude protein levels and TRP would affect both growth and neurotransmitter metabolism. Heart, brain and pancreatic neurotransmitter (noradrenaline (NA), dopamine(DA), serotonin (5-HT) and 5-hydroxy-indole-3-acetic acid (5-HIAA) concentrations were determined by HPLC separation and electrochemical detection. Malate dehydrogenase (2-oxoglntarate decarboxylating) (NADP+) (MDH(NADP+); EC 1.1.1.40), isocitrate dehydrogenase (NADP+) (ICD(NADP+); EC 1.1.1.42) and aspartate aminotransferase (AAT; EC 2.6.1.1) activities were also measured. Supplemental TRP decreased growth and feed intake. Increasing dietary crude protein decreased MDH(NADP+), but increased (ICD(NADP+) and AAT activities. Additional dietary TRP decreased MDH(NADP+) activity, but had no effect on other enzyme activities. Cardiac NA concentrations were directly related to dietary crude protein levels while pancreatic levels were inversely related. An increase in dietary crude protein decreased both brain NA and DA. Supplemental dietary TRP increased both 5- HIAA and 5-HT. Changes in feed intake caused by different levels of botb dietary crude protein and TRP are accompanied by altered levels of neurotransmitters. The present study indicates that much arger amounts of TRP are required to make simultaneous changes in feed intake and neurotransmitters.

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