凹凸棒石黏土对饲料颗粒质量及樱桃谷肉鸭生长性能、屠宰性能、肌肉品质和抗氧化性能的影响

[Objectives] This study was conducted to investigate the effect of different levels of dietary palygorskite supplementation on pellet quality, growth performance, slaughter performance, meat quality and antioxidant ability in Cherry Valley ducks. [Methods] According to the randomized block design, a total of 720 one-day-old Cherry Valley ducks were randomly divided into 4 dietary treatment groups with 6 replicates of 30 ducks per replicate, and fed a basal diet supplemented with 0(control group), 5, 10 and 20 g·kg-1 palygorskite. The experiment period was 42 days, which consisted of the starter period(1 to 14 days)and grower period(15 to 42 days). At the end of the experiment, 1 male duck per replicate was randomly selected for measuring the relevant indexes. [Results] Compared with the control group, three levels palygorskite supplementation increased the hardness and decreased the fines percentage of pellet during starter period(P < 0.05). The inclusion of 20 g·kg-1 palygorskite increased the pellet hardness of pellet during grower period(P < 0.05), and other levels palygorskite supplementation did not affect the pellet hardness and the fines percentage of pellet during grower period(P>0.05). Palygorskite supplementation, regardless of levels, did not affect the final body weight, average daily feed intake, average daily weight gain and the ratio of feed intake to gain(F/G)of ducks. However, the percentage of breast muscle, leg muscle and lean muscle increased when supplementing 10 g·kg-1 palygorskite(P < 0.05), and the inclusion of 20 g·kg-1 palygorskite increased the percentage of leg muscle and lean muscle(P < 0.05), but had no effect on the percentage of breast muscle(P>0.05). 10 g·kg-1 palygorskite supplementation showed higher leg muscle percentage than 20 g·kg-1 palygorskite supplementation(P < 0.05). In addition, three levels palygorskite supplementation all significantly decreased the drip loss of breast muscle(P < 0.05). The inclusion of 20 g·kg-1 palygorskite decreased the cooking loss of breast muscle(P < 0.05). Similarly, the redness(a*)of breast muscle and the drip loss of leg muscle decreased significantly(P < 0.05)when the palygorskite inclusion dosage was 10 g·kg-1. 10 and 20 g·kg-1 palygorskite supplementation all significantly increased the superoxide dismutase(SOD)activity of breast muscle(P < 0.05), and 5 g·kg-1 palygorskite supplementation increased the glutathione peroxidase(GSH-Px)activity of breast muscle(P < 0.05). The inclusion of 10 g·kg-1 palygorskite supplementation increased the superoxide dismutase activity of leg muscle. Whereas the malonaldehyde(MDA)contents of leg muscle decreased significantly(P < 0.05)by three levels palygorskite supplementation. [Conclusions] The basic dietary palygorskite supplementation could improve the feed pellet quality, enhance slaughter performance and meat quality, and increase antioxidant ability, and had no disadvantageous effect on the growth performance of Cherry Valley ducks. In addition, the optimal level of supplemented palygorsskite in the pellet diets of ducks was 10 g·kg-1. [ABSTRACT FROM AUTHOR]