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Balanced nutrient density for broiler chickens using a range of digestible lysine-to-metabolizable energy ratios and nutrient density:Growth performance,nutrient utilisation and apparent metabolizable energy

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Animal Nutrition 2021年第2期7卷 430-439页

作者： Reza Barekatain Luis F.Romero JoséOtávio B.Sorbara Aaron J.Cowieson South Australian Research and Development Institute Roseworthy CampusRoseworthySA5371Australia School of Animal and Veterinary Sciences Roseworthy CampusUniversity of AdelaideSA5371Australia Animal Nutrition and Health DSM Nutritional ProductsKaiseraugst4303Switzerland

Currently,specific nutrient concentration,metabolizable energy(ME)and digestible amino acids are used as feed formulation criteria.A balanced nutrient density(BND)concept based on 2 criteria of nutrient density and balanced amino acids-to-ME ratio may offer more flexibility in optimisation of profit in formulation of diets compared with current formulation based on set values per unit of feed mass.A total of 672 one-d-old off-sex male Ross 308 broiler chickens were used across two 42-d performance trials in a 3×2 factorial arrangement of treatments with each diet replicated 8 times(14 birds per replicate).The experimental factors were 2 nutrient density levels(low[LD]and high[HD])and 3 digestible lysine-to-ME ratios(DLYS:ME;low,medium,and high).Low density diets had ME of 2,876 and 3,023 kcal/kg for starter and finisher,respectively,while values for HD diets were 3,169 and 3,315 kcal/kg with proportionally higher non-nitrogenated *** digestibility and apparent metaboliz-able energy(AME)assays were conducted at d 21 and *** assays at d 7 were conducted on birds used for performance *** of the diet density,birds fed low DLYS:ME had a lower(P<0.01)feed intake(d 0 to 42)than medium and high DLYS:*** interaction,birds fed low and medium DLYS:ME had a similar body weight gain being the heaviest while birds low DLYS:ME were the *** an interaction(P<0.05),the highest overall FCR value was observed for birds fed LD×low DLYS:ME and improved linearly when DLYS:ME increased to the highest level reaching a limit for birds fed HD×medium DLYS:*** conversion linearly decreased(P<0.001)with increments in DLYS:*** and ileal starch and protein digestibility were affected on d 21 and 42 but not on d 7 of *** the independence of response on BW and feed consumption,the use of BND as a flexible system in diet formulations has the potential to enable more accurate formulation for optimisation of growth performance

关键词： nutrient density Metabolizable energy Lysine Digestibility Optimisation

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Calcium supplementation in low nutrient density diet for meat ducksimproves breast meat tenderness associated with myocyte apoptosisand proteolytic changes

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Animal Nutrition 2022年第2期9卷 49-59页

作者： Huaiyong Zhang Quifeng Zeng Shiping Bai Jianping Wang Xuemei Ding Yue Xuan Zhuowei Su Joris Michiels Keying Zhang Institute of Animal Nutrition Key Laboratory for Animal Disease-Resistance Nutrition of Chin1Ministry of EducationSichuan Agricultural UniversityChengdu611130China College of Animal Science and Technology Henan Agricultural UniversityZhengzhou450002China Laboratory for Animal Nutrition and Animal Product Quality Department of Animal Sciences and Aquatic EcologyGhent UniversityGhent9000Belgium

To define the relationship between dietary nutrient density, calcium (Ca), and meat quality in meatducks. A total of 288 male Cherry Valley SM3 medium ducklings were fed a common standard starter dietuntil d 14. At 15 d of age, ducks were randomly divided into 2 treatment groups and fed either a conventionaldiet or a low nutrient density (LND) diet. Compared with the conventional diet, the energy wasreduced in the LND diet by 8.6% and 16.8% in grower (15 to 35 d) and finisher (36 to 56 d) phases,respectively, while other essential nutrients were kept proportionate to energy. The LND diet decreasedthe shear force (P < 0.05) and increased the lightness values of the pectoralis muscle when compared tothe conventional diet, suggesting that LND diet exerted a beneficial role in meat quality. Subsequently,the effects of grated Ca in the LND diet on meat quality of pectoralis muscle were evaluated. A total of 576male ducklings were fed a common starter diet until d 14, followed by feeding 4 LND diets with 0.5%,0.7%, 0.9%, and 1.1% Ca. The results show that LND diets with 0.7% or more Ca decreased the shear force ofpectoralis major muscle in 42-d-old meat ducks (P < 0.05). To explore the mechanism underlying Ca andtenderness, data from birds fed either 0.5% or 1.1% Ca in the LND diet indicated that birds fed 1.1% Caexhibited lower shear force, upregulated calpains 1 expression, and higher calpains activity compared tothose fed the LND diet with 0.5% Ca (P < 0.05). Moreover, the 1.1% Ca LND diet induced a higher myocyteapoptosis (P =0.06) and upregulated mRNA expression of caspase-3 (P =0.07) in breast muscle. Our datasuggest that LND diets with 0.9% or 1.1% Ca had a positive role in the tenderness of breast meat,particularly the enhancing effect of 1.1% Ca LND diet on tenderness seems to be associated with proteolyticchanges of myofibrillar proteins and myocyte apoptosis in meat ducks.

关键词： nutrient density Ca Tenderness Meat duck

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Influence of Lighting Regime and nutrient density on Performance and Welfare of Broiler Chickens

Influence of Lighting Regime and Nutrient Density on Perform...

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中国畜牧兽医学会动物营养学分会第十一次全国动物营养学术研讨会

作者：唐诗陈继兰 Institute Animal science CAASBeijin 100193

Lighting schedule and nutrient density are both crucial elements for broiler *** can affect broiler performance and welfare,which can be indicated from their behavior rhythm.(Purpose) So this experiment is conducted to evaluate the effects of lighting regime and nutrient density on growth performance and welfare of broiler chickens.(Methods) A total of 1 080 day-old Beijing-You chickens were used with a 3×3 factorial arrangement of *** birds were given 23 hours day-length from 0 to 7 d of age to ensure adaptation to the research *** 8 d,the experimental treatments consisting of three lighting regimes will be randomly assigned to four *** three lighting regimes are 23L;1D(continuous),16L;8D(simulating natural lighting) and 16L;8D(intermittent,3L;ID).The three treatments of nutrient density are high[starter diet;12.33 MJ/kg apparent metabolisable energy(AME),21.40%crude protein(CP);finisher diet;13.17 MJ AME/kg,16.30%CP],middle[starter diet:12.12 MJ/kg apparent metabolisable energy(AME), 21.00%crude protein(CP);finisher diet;12.96 MJ AME/kg,16.00%CP]and low(L,starter diet;11.91 MJ AME/kg,20.60%CP;finisher diet;12.75 MJ AME/kg,15.80%CP) energy and protein levels. All chickens were randomly allocated to 12 treatments with each treatment comprising 4 replicates of 30 chickens. (Results) Lighting schedules showed no difference in growth Performance at the end the experiment(P > 0.05).Birds on low density diets had higher feed conversion ratio(FCR)(P nutrient density for the health and efficient production of broilers.

关键词： Broiler Chickens Lighting regime nutrient density welfare

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Influence of Lighting Regime and nutrient density on Welfare of Yellow-feather Broiler Chickens

Influence of Lighting Regime and Nutrient Density on Welfare...

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中国畜牧兽医学会家禽学分会第九次代表会议暨第十六次全国家禽学术讨论会

作者： TANG Shi BAI Hao QIN Ning LIU Nian HUA Dengke WEN Jie LIU Ranran ZHAO GuiPing ZHENG Maiqing CHEN JiLan State Key Laboratory of Animal Nutrition Institute Animal ScienceCAAS College of Animal Science and Technology Yangzhou University

1 INTRODUCTION Lighting is a powerful exogenous factor in control of many physiological and behavioral *** status is an important factor affecting broiler health(Kidd,2004;Brickett et al.,2007),and can indirectly affect the *** this experiment was conducted to evaluate the effects of lighting regime and nutrient density on welfare of broiler chickens.

关键词： broiler chickens lighting regime nutrient density welfare

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