Effects of Dietary Non-Phytate Phosphorus Level on Growth Performance and Digestive Function of Meat Ducks

WANG Ju; ZHAO Hua; CHEN Xiaoling; LIU Guangmang; TIAN Gang; CAI Jingyi; JIA Gang

doi:10.3969/j.issn.1006-267x.2020.01.026

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 1: 206 - 214

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.01.026

Effects of Dietary Non-Phytate Phosphorus Level on Growth Performance and Digestive Function of Meat Ducks

WANG Ju ,
ZHAO Hua ,
CHEN Xiaoling ,
LIU Guangmang ,
TIAN Gang ,
CAI Jingyi ,
JIA Gang

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Key Laboratory of Animal Disease-Resistant Nutrition, Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China

Received date: 2019-07-24

Online published: 2020-01-19

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Abstract

The purpose of this study was to investigate the effects of dietary non-phytate phosphorus (NPP) level on growth performance and digestive function of meat ducks. A total of 768 one-day-old male Cherry Valley male ducks with similar average body weight were randomly allotted into 6 groups with 8 replicates per group and 16 ducks per replicate. Dietary NPP levels of six groups were 0.24%, 0.34%, 0.44%, 0.54%, 0.64% and 0.74%, respectively, and the dietary calcium level was all 1.00%, the NPP was added in the form of calcium hydrogen phosphate. The experiment lasted for 35 days. The results showed as follows:1) the average daily gain (ADG) and feed intake (FI) of ducks during 1 to 14 days of age and 15 to 35 days of age of 0.54% group were significantly higher than those of 0.34% group (P<0.05), and the ratio of feed to gain (F/G) of ducks during 1 to 14 days of age of 0.54% group was significantly lower than that of 0.34% group (P<0.05). 2) The pancreas absolute weight of ducks of 0.54% and 0.64% groups was significantly higher than that of 0.34% and 0.74% group (P<0.05), and the muscular stomach absolute weight of ducks of 0.34% group was significantly lower than that of 0.44%, 0.54% and 0.64% groups (P<0.05). The liver relative weight of ducks of 0.34% group was significantly higher than that of other groups (P<0.05), and the muscular stomach relative weight of ducks of 0.64% group was significantly higher than that of 0.74% group (P<0.05). 3) The jejunum absolute weight of ducks of 0.74% group was significantly higher than that of 0.34% group (P<0.05), and the ileum absolute weight of ducks of 0.64% group was significantly higher than that of 0.34% group (P<0.05). The duodenum relative weight of ducks of 0.44% group was significantly lower than that of 0.34% group (P<0.05). The duodenum absolute length of ducks of 0.64% group was significantly higher than that of 0.44% group (P<0.05). The relative length of duodenum, jejunum and ileum of ducks of 0.34% group was significantly higher than that of other groups (P<0.05). 4) The villus height of duodenum, jejunum and ileum of ducks of 0.44% group was significantly higher than that of other groups (P<0.05). The crypt depth of duodenum and ileum of ducks of 0.34% group was significantly lower than that of other groups (P<0.05), and the crypt depth of jejunum of ducks of 0.64% group was significantly higher than that of other groups (P<0.05). The villus height to crypt depth of duodenum and ileum of ducks of 0.44% group was significantly higher than that of other groups (P<0.05), and the villus height to crypt depth of jejunum of ducks of 0.44% and 0.54% groups was significantly higher than that of other groups (P<0.05). 5) The activities of amylase and trypsin in pancreas of ducks of 0.44% group were significantly higher than those of other groups (P<0.05). The duodenal mucosa alkaline phosphatase (AKP) activity of ducks of 0.34% group was significantly higher than that of 0.44% and 0.74% groups (P<0.05), the jejunal mucosa AKP activity of ducks of 0.34% group was significantly higher than that of other groups (P<0.05), and the ileal mucosa maltase activity of ducks of 0.44% group was significantly higher than that of 0.34% and 0.54% groups (P<0.05). 6) The apparent digestibilities of energy, dry matter and crude protein of ducks of 0.54% group were significantly higher than those of 0.34% group (P<0.05), the ether extract apparent digestibility of ducks of 0.54% and 0.74% groups was significantly higher than that of 0.34% group (P<0.05), the calcium apparent digestibility of ducks of 0.34% and 0.44% groups was significantly higher than that of other groups (P<0.05), and the total phosphorus apparent digestibility of ducks of 0.34% group was significantly lower than that of other groups (P<0.05). In conclusion, when the dietary NPP level is 0.54%, the growth performance is the best, and the appropriate dietary NPP level can enhance digestive function and increase digestion and absorption of nutrients by improving digestive organ index, intestinal morphology and promote digestive enzyme activity of meat ducks.

Key words： non-phytate phosphorus; meat ducks; growth performance; digestive function

Cite this article

WANG Ju , ZHAO Hua , CHEN Xiaoling , LIU Guangmang , TIAN Gang , CAI Jingyi , JIA Gang . Effects of Dietary Non-Phytate Phosphorus Level on Growth Performance and Digestive Function of Meat Ducks[J]. Chinese Journal of Animal Nutrition, 2020 , 32(1) : 206 -214 . DOI: 10.3969/j.issn.1006-267x.2020.01.026

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