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This study aimed to evaluate the effect of  in ovo  injection of folic acid (FA) and sulfur amino acids (SAAs) on the mitotic activity of myocytes, performance, relative organ weight, hematological values, and characteristics of broiler chicken carcasses. A total of 1200 fertile eggs from 42-week-old Ross AP ©  breeders were inoculated in the albumen on the first day of incubation in a completely randomized design with one of the treatments: C—intact eggs; SS: inoculation with 0.5 mL of saline solution; FA: 0.150 mg of FA; SAA: 5.90 mg of L-methionine and 3.40 mg of L-cysteine; or FA/SAA: FA + SAA. The inoculation of SAA did not influence ( p  &gt; 0.05) the post-hatching characteristics of the chickens. FA inoculation increased ( p  &lt; 0.05) the expression of the PAX7 and MYF genes in the  pectoralis  muscle of hatched chicks and reduced ( p  &lt; 0.05) feed conversion at 42 days of age. The combination of SAA + FA increased ( p  &lt; 0.05) the depth of the ileal crypt on the 1st day after hatching and the relative weight of the spleen and thymus on the 21st day of life. In conclusion, the inoculation of FA on the 1st day of incubation increases gene expression and improves the performance of broilers.

animal biotechnology

The effects of  in ovo  injection with sulfur amino acids and folic acid on the gene expression, relative organ weights, hematologic parameters, performance, and carcass characteristics of broiler chickens