Effects of Zinc Glycinate on Productive and Reproductive Performance, Zinc Concentration and Antioxidant Status in Broiler Breeders

Abstract

An experiment was conducted to investigate the effects of zinc glycinate (Zn-Gly) supplementation as an alternative for zinc sulphate (ZnSO) on productive and reproductive performance, zinc (Zn) concentration and antioxidant status in broiler breeders. Six hundred 39-week-old Lingnan Yellow broiler breeders were randomly assigned to 6 groups consisting of 4 replicates with 25 birds each. Breeders were fed a basal diet (control group, 24 mg Zn/kg diet), basal diet supplemented with 80 mg Zn/kg diet from ZnSO or basal diet supplemented with 20, 40, 60 and 80 mg Zn/kg diet from Zn-Gly. The experiment lasted for 8 weeks after a 4-week pre-test with the basal diet, respectively. Results showed that Zn supplementation, regardless of sources, improved (P < 0.05) the feed conversion ratio (kilogram of feed/kilogram of egg) and decreased broken egg rate, and elevated (P < 0.05) the qualified chick rate. Compared with the ZnSO group, the 80 mg Zn/kg Zn-Gly group significantly increased (P < 0.05) average egg weight, fertility, hatchability and qualified chick rate, whereas it decreased (P < 0.05) broken egg rate. The Zn concentrations in liver and muscle were significantly higher (P < 0.05) in 80 mg Zn/kg Zn-Gly group than that in ZnSO group. Compared with ZnSO group, 80 mg Zn/kg Zn-Gly group significantly elevated (P < 0.05) the mRNA abundances of metallothionein (MT) and copper-zinc superoxide (Cu-Zn SOD), as well as the Cu-Zn SOD activity and MT concentration in liver. Moreover, the 80 mg Zn/kg Zn-Gly group had higher (P < 0.05) serum T-SOD and Cu-Zn SOD activities than that in the ZnSO group. This study indicated that supplementation of Zn in basal diet improved productive and reproductive performance, Zn concentration and antioxidant status in broiler breeders, and the 80 mg Zn/kg from Zn-Gly was the optimum choice for broiler breeders compared with other levels of Zn from Zn-Gly and 80 mg/kg Zn from ZnSO.

Effects of inorganic trace minerals replaced by complexed glycinates on reproductive performance, blood profiles, and antioxidant status in broiler breeders

“…Zn as a component of Cu/Zn-SOD protects proteins and enzymes from radical attacks, and second, Zn prevents the free radicals' formation from other metals (Fe and Cu) ( Kucuk, 2008 ). It is also demonstrated in previous studies that broiler breeders showed better antioxidant status by feeding organic Zn as compared to inorganic form ( Zhang et al., 2017 ) and reduced the level of serum and liver MDA ( Sahin et al., 2005 , Sun et al., 2012 ). In line with the present findings, it is suggested by other studies that broiler breeders show better antioxidant status by feeding OTM compared with ITM ( Wang et al., 2019a ).…”

“…Glycinate minerals complex are preferred organic source of TM due to their good stability, palatability, and electrical neutrality ( Zhang et al., 2017 ). Glycine being the lowest molecular weight amino acid favors the stability of chelate compounds and avoids the release of TM in the stomach and intestine ( Kulkarni et al., 2011 ).…”

“…Zn-Gly improves intestinal absorption of Zn which is positively linked with growth performance of broilers ( dos Santos et al., 2010 , Feng et al., 2010 , Ma et al., 2011 ). Zn-Gly showed significantly higher Zn retention in the muscle, liver, and albumen than ZnSO 4 at the same dose rate with positive effects on reproductive performance of broilers breeders ( Zhang et al., 2017 ) . Zn-Gly supplementation significantly improved the intestinal maturity ( Ma et al., 2011 ), which is related to the better growth performance of broilers.…”

Broyler Dişi Damızlık Rasyonlarında Kullanılan İz Mineral Premiksi Formunun Üreme Performansı, Kuluçka Özellikleri ve Kuluçka Sonrası Civcivlerde Büyüme Performansı ve Karkas Parametreleri Üzerine Etkileri

“…In poultry, diets trace minerals are essential as they play important roles on male and female breeders' reproduction performance, biochemical processes required and embryo development [3][4][5] . It has been reported that good nutritional condition of the parents is vital for transferring of required nutrients for development of the embryo [6,7] . Some important interrelationships between several micronutrients and other nutrients have been reported and these interrelationships may affect the reproduction and production of hens, especially during the last period of production [8] .…”

The Effect of High-Level Dietary Supplementation with Different Zinc Sources on Performance, Eggshell Quality and Bone Characteristics in Layer Quails

“…It is known that organic sources of Zn present greater bioavailability than inorganic sources for poultry (Wedekind et al, 1992). Zinc glycine (Zn-Gly) chelates, which are better in terms of structural stability and neutral electrical charge, have higher stability than zinc methionine chelates (Kratzer and Vohra, 1986;Zhang et al, 2017). Olgun and Yildiz (2017) report that a glycine chelate of Zn is more effective than nano or inorganic sources in improving eggshell quality in laying hens.…”