title: Effects of arsenic supplementation in feed on laying performance, arsenic retention of eggs and organs, biochemical indices and endocrine hormones.
abstract: 1. The primary objective of this experiment was to estimate the toxic effects of arsenic (As) supplementation in feed on laying performance, As retention by eggs and organs, serum biochemical indices and endocrine hormones in laying hens. 2. A total of 320 "Jinghong Number 1" hens, 56-week-old, were randomly allocated into four treatments of four replicates with 20 layers in each. Graded arsenical was added to the basal diet in the experimental diets at As levels of 0, 17, 34 and 51 mg/kg, respectively. The trial lasted for 9 weeks including 1 week for acclimatisation. 3. Supplementation of dietary As for eight weeks had no effect on laying performance. As retention in albumen, yolk, egg, liver and kidney increased as As levels increased The level of serum phosphorus (P) was minimised at the 17 mg As/kg group. The activity of serum glutamic oxaloacetic transaminase (GOT) increased linearly. No differences were observed for levels of serum calcium (Ca), alkaline phosphatase (AKP) and serum glutamic pyruvic transaminase (GPT). Concentrations of estradiol (E2) and progesterone (PG) declined at 34 and 51 mg/kg As levels compared with the control group. As supplementation exerted no influence on levels of serum follicle stimulating hormone (FSH), luteinising hormone (LH), triiodothyronine (T3), thyroxine (T4) and the ratio between T3and T4. 4. In conclusion, dietary As supplementation accelerated retention in tissues and eggs, and affected the laying rate by diminishing hormone levels of E2 and PG at 51 mg/kg.
authors.affiliation: a Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Feed Science Institute, College of Animal Science , Zhejiang University (Zijingang Campus) , Hangzhou , China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Zhang
authors.affiliation: a Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Feed Science Institute, College of Animal Science , Zhejiang University (Zijingang Campus) , Hangzhou , China.
authors.forename: M Y
authors.initials: MY
authors.lastname: Zhou
authors.affiliation: a Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Feed Science Institute, College of Animal Science , Zhejiang University (Zijingang Campus) , Hangzhou , China.
authors.forename: L L
authors.initials: LL
authors.lastname: Li
authors.affiliation: a Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Feed Science Institute, College of Animal Science , Zhejiang University (Zijingang Campus) , Hangzhou , China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Jiang
authors.affiliation: a Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Feed Science Institute, College of Animal Science , Zhejiang University (Zijingang Campus) , Hangzhou , China.
authors.forename: X T
authors.initials: XT
authors.lastname: Zou
mesh_terms: D000821:Animal Feed; D000818:Animals; D001151:Arsenic / Q000008:administration & dosage / Q000032:analysis* / Q000633:toxicity*; D001219:Aspartate Aminotransferases / Q000097:blood; D002645:Chickens / Q000378:metabolism / Q000502:physiology*; D002681:China; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements / Q000633:toxicity; D004530:Egg Yolk / Q000737:chemistry; D004958:Estradiol / Q000097:blood; D005260:Female; D005506:Food Contamination / Q000032:analysis; D007668:Kidney / Q000737:chemistry; D010047:Ovalbumin / Q000737:chemistry; D010058:Oviposition / Q000187:drug effects*; D010063:Ovum / Q000737:chemistry; D010758:Phosphorus / Q000097:blood; D011374:Progesterone / Q000097:blood
chemical_list: D010758:Phosphorus; D011374:Progesterone; D004958:Estradiol; D010047:Ovalbumin; D001219:Aspartate Aminotransferases; D001151:Arsenic
keywords: Arsenic; arsenic retention; biochemical indices; endocrine hormone; laying performance