scholarly journals Increased egg production in juvenile turkey hens after active immunization with vasoactive intestinal peptide

1999 ◽  
Vol 78 (6) ◽  
pp. 899-901 ◽  
Author(s):  
Caldwell ◽  
AF Johnson ◽  
TD Yule ◽  
JL Grimes ◽  
M Ficken ◽  
...  
Keyword(s):  
Vasoactive Intestinal Peptide ◽  
Egg Production ◽  
Active Immunization

Active Immunization with Vasoactive Intestinal Peptide Prevents the Secretion of Prolactin Induced by Electrical Stimulation of the Turkey Hypothalamus

1994 ◽  
Vol 95 (3) ◽  
pp. 330-336 ◽  
Author(s):  
Orlan M. Youngren ◽  
Janet L. Silsby ◽  
Israel Rozenboim ◽  
Richard E. Phillips ◽  
Mohamed E. El Halawani
Keyword(s):  
Electrical Stimulation ◽  
Vasoactive Intestinal Peptide ◽  
Active Immunization ◽  
Stimulation Of

scholarly journals The effect of active immunization against vasoactive intestinal peptide and inhibin on reproductive performance of young White Leghorn roosters

2011 ◽  
Vol 90 (10) ◽  
pp. 2321-2331 ◽  
Author(s):  
N. Avital-Cohen ◽  
R. Heiblum ◽  
N. Argov ◽  
A. Rosenstrauch ◽  
Y. Chaiseha ◽  
...  
Keyword(s):  
Vasoactive Intestinal Peptide ◽  
Reproductive Performance ◽  
Active Immunization ◽  
White Leghorn

scholarly journals Association of polymorphisms of vasoactive intestinal peptide and its receptor with reproductive traits of turkey hens

2020 ◽  
Vol 50 (3) ◽  
pp. 345-352
Author(s):  
L. Hosseinpour ◽  
S. Nikbin ◽  
N. Hedayat-Evrigh ◽  
G. Elyasi-Zarringhabaie
Keyword(s):  
Vasoactive Intestinal Peptide ◽  
Egg Production ◽  
Pcr Amplification ◽  
Reproductive Traits ◽  
Single Strand Conformation Polymorphism ◽  
Production Traits ◽  
Single Nucleotide ◽  
Egg Weight ◽  
Association Analyses ◽  
Intron 2

The aim of this study was to identify variations of vasoactive intestinal peptide (VIP) and VIP receptor-1 (VIPR-1) genes that might be associated with turkey reproductive traits. One hundred twenty turkey hens were recorded for age at first egg (AFE), first egg weight (FEW), egg number (EN), total egg weight (TEW), laying period (LP), and broodiness. The DNA was isolated from blood samples and subjected to PCR amplification of the meleagrine VIP and VIPR-1 genes. The SNPs were detected by single-strand conformation polymorphism and the variant DNA fragments were sequenced. One mutation in 3’-UTR of VIP (G5846A) and two SNPs in intron 2 of VIPR-1 (C17687T and A17690T) were found, all of them novel. The associations of the three detected SNPs with the reproductive traits of turkeys were evaluated. The detected polymorphisms were used for marker-trait association analyses. The results of association analysis showed that G5846A on 3’ UTR of VIP has a significant association with LP, EN, TEW, and AFE. The G allele of G5846A was the favourable SNP allele for LP, EN, and TEW traits. The AA genotype of A17690T on intron 2 of VIPR-1 was significantly associated with higher LP, EN, and TEW. AGAA haplotype showed association with higher EN and TEW. These results suggest that the SNPs in 3’-UTR of VIP and intron 2 of VIPR-1 genes may influence egg production traits in turkey hens.Keywords: broodiness, candidate gene, egg production, single nucleotide polymorphism, VIPR-1

scholarly journals Temperature Stress and Turkey Reproduction

2002 ◽  
Author(s):  
Mohamed El Halawani ◽  
Israel Rozenboim
Keyword(s):  
Heat Stress ◽  
Temperature Stress ◽  
Reproductive Performance ◽  
Egg Production ◽  
Detrimental Effect ◽  
The United States ◽  
High Temperature Stress ◽  
Active Immunization ◽  
Reproductive Stage ◽  
Subunit Mrna

High temperature stress is of major concern to turkey producers in Israel and the United States. The decline in the rate of egg production at high environmental temperature is well recognized, but the neuroendocrinological basis is not understood. Our objectives were: 1) to characterize the hypothalamo-hypophyseal axis involvement in the mechanism(s) underlying the detrimental effect of heat stress on reproduction, and 2) to establish procedures that alleviate the damaging effect of heat stress on reproduction. Heat stress (40oC, Israel; 32oC, U.S.) caused significant reduction in egg production, which was restored by VIP immunoneutralization. The decline in egg production did not appear to be entirely related to the expression of incubation behavior due to the rise in circulating PRL in stressed birds. Heat stress was found to increase circulating PRL in ovariectomized turkeys independent of the reproductive stage. Active immunization against VIP was shown for the first time to up-regulate LHb and FSHb subunit mRNA contents. These findings taken together with the results that the heat stress-induced decline in egg production may not be dependent upon the reproductive stage, lead to the suggestion that the detrimental effect of heat stress on reproductive performance may be in part mediated by VIP acting directly on the GnRH/gonadotropin system. Inhibin (INH) immunoneutralization has been shown to enhance FSH secretion and induces ovulation in mammals. It is hypothesized that immunization of heat-stressed turkeys against INH will increase levels of circulating FSH and the number of preovulating follicles which leads to improved reproductive performance. We have cloned and expressed turkey INH-a and INH-bA. Active immunization of turkey hens with rtINH-a increased pituitary FSH-b subunit mRNA and the number of non-graded preovulatory yellow follicles, but no significant increase in egg production was observed.

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