Additionally, during the early development of the embryo, the oxidative metabolism leads to the production of large quantities of free radicals in many tissues, making them more susceptible to oxidative damage (Selim et al., 2012). Polyunsaturated fatty acids are susceptible to oxidation owing to the double bonds in the hydrocarbon chain. During early development, the embryo uses lipids and other nutrients in the yolk sac for growth. Lipids in quail eggs contain about 56% to 58% unsaturated fatty acids, while the yolk contains between 0.20 and 0.21 g/kg polyunsaturated fatty acids (PUFAs), which comprise 14% of the total lipids in the yolk (Genchev, 2012). Keywords: embryology, embryo metabolism, hatchery, incubation, breeder nutrition The inclusion of 3.0 g/kg of guava extract in the diet of Japanese quail breeder hens increased the hatchling weight of the chicks and improved the villus to crypt ratio of their duodenum. The quality score of newly hatched quail was similar across treatments. Use of up to 3.0 g/kg of guava extract in the diet increased the weight of both eggs and newly hatched chicks. The number of infertile eggs was lower in the groups that received 3.0 and 9.0 g/kg of extract in their diets. The guava extract did not affect mortality rate, live pecking, dead pecking, and contaminated and inverted eggs. Differences among the treatments in hatchability and the hatch window were not significant. The hatch window, hatchability, embryo development in unhatched eggs, quality of newly hatched quails, and intestinal histomorphometry of a duodenum segment were evaluated. The eggs were incubated at 37.5 ☌ and 65% relative air humidity. The guava extract contained 2% ellagic acid. The study consisted of four treatments, six replicates, and 27 eggs per replicate. Six hundred and forty-eight eggs were collected from Japanese quail hens fed diets with 0.0, 3.0, 6.0, and 9.0 g/kg -1 of guava extract. The aim of this study was to evaluate the effects of guava extract as a dietary supplement for Japanese quail hens on incubation parameters, intestinal development, and the quality of newly hatched chicks. IIFederal University of Minas Gerais, School of Veterinary Medicine, Belo Horizonte, Minas Gerais, Brazil IFederal University of Goiás, Department of Animal Science, Goiânia, Goiás, Brazil Variation in quality of newly hatched chicks from Japanese breeder quail fed guava extract
0 Comments
Leave a Reply. |