scholarly journals Reproductive efficiency of Pelibuey and Romanov × Pelibuey ewes synchronized with synthetic progesterone and low doses of PMSG under a hot environment 

2013 ◽  
Vol 58 (No. 12) ◽  
pp. 546-553 ◽  
Author(s):  
U. Macías-Cruz ◽  
J.L. Ponce-Covarrubias ◽  
F.D. Álvarez-Valenzuela ◽  
A. Correa-Calderón ◽  
C.A. Meza-Herrera ◽  
...  
Keyword(s):  
Heat Stress ◽  
Reproductive Performance ◽  
Stress Conditions ◽  
Reproductive Efficiency ◽  
Gestation Length ◽  
Low Doses ◽  
Hot Environment ◽  
Pregnant Mare Serum Gonadotropin ◽  
Genotype Interaction ◽  
Serum Gonadotropin

Thirty-nine multiparous ewes (19 Pelibuey and 20 Romanov × Pelibuey) treated with fluorogestone acetate impregnated intravaginal sponges were used to evaluate the effects of low pregnant mare serum gonadotropin (PMSG) doses and genotype on their reproductive efficiency under heat stress conditions. The sponge treatment lasted for 12 days, and 24 h before sponge removal, ewes of each genotype were injected with 140 or 280 IU of PMSG. Ewes showing estrus were naturally mated twice. Reproductive performance was not affected (P > 0.05) by the dose × genotype interaction. All treated ewes presented estrus signs within a 48-h period after sponge removal. Shorter (P < 0.05) estrus interval and higher (P < 0.05) fecundity were observed in ewes treated with 280 IU of PMSG compared to those treated with 140 IU. Pelibuey ewes exhibited shorter (P < 0.01) estrus interval and greater (P < 0.01) fertility as compared with Romanov × Pelibuey ewes. The response to estrus, gestation length, prolificacy, and percentage of single and multiple lambing were not affected (P >  0.05) by dose or genotype. In conclusion, under heat stress conditions, low PMSG doses as 140 or 280 IU can be used to successfully induce and/or synchronize the estrus in Pelibuey ewes and their crosses with Romanov, regardless of reduced fertility observed in crossed Pelibuey ewes. If a more predictable and compact estrus is required, administration of 280 IU of PMSG is recommended.

Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions

2017 ◽  
Vol 5 (3) ◽  
pp. 91-96 ◽  
Author(s):  
José Romero Alexandre Alves ◽  
Thiago Antunes Adriano de Andrade ◽  
Daniel de Medeiros Assis ◽  
Thyago Araújo Gurjão ◽  
Lídio Ricardo Bezerra de Melo ◽  
...  
Keyword(s):  
Heat Stress ◽  
Reproductive Performance ◽  
Stress Conditions ◽  
Performance Behavior

scholarly journals Methionine supplementation improves reproductive performance, antioxidant status, immunity and maternal antibody transmission in breeder Japanese quail under heat stress conditions

2019 ◽  
Vol 62 (1) ◽  
pp. 275-286 ◽  
Author(s):  
Omid Kalvandi ◽  
Amirali Sadeghi ◽  
Ahmad Karimi
Keyword(s):  
Heat Stress ◽  
Reproductive Performance ◽  
Antioxidant Status ◽  
Egg Production ◽  
Basal Diet ◽  
Egg Yolk ◽  
Maternal Serum ◽  
Stress Conditions ◽  
Negative Effects ◽  
Serum Igg

Abstract. This study was conducted to determine the effects of methionine (Met) supplementation on productive and reproductive performance, immune response and antioxidant status in breeder quails reared under heat stress (HS). A total of 125 breeder quails were divided into five groups. One group was kept in an environmentally controlled room at 22 ∘C and considered as thermoneutral, and four groups were kept at 34 ∘C and fed a basal diet (heat stressed) or a basal diet with Met concentrations 1.15, 1.30 and 1.45 times the quail requirements per NRC (1994) recommendations. HS decreased egg production in birds fed the basal diet (P < 0.05). Higher feed intake (P < 0.05), egg production (P < 0.05), improved feed efficiency (P < 0.05) and Haugh unit and hatchability variables (P < 0.05) occurred in Met supplemented groups. Birds receiving Met under HS had higher maternal serum IgG, egg yolk IgY and offspring serum IgG (mg mL−1). Quails receiving the Met supplementation diets exhibited higher (P < 0.05) plasma levels and liver activity of superoxide dismutase, catalase and glutathione peroxidase as well as lower (P < 0.05) plasma and liver levels of malondialdehyde compared to the HS group fed the basal diet. All breeder quails receiving the Met supplement had lower (P < 0.05) heterophil and H∕L ratios as well as higher (P < 0.05) lymphocytes than quails fed the basal diet under the same stress conditions. Our results suggest that dietary supplementation with Met could improve the performance, immunity and antioxidant status of quails by reducing the negative effects of HS.

Comparison of one-quarter Chinese Meishan and three-breed conventional cross females for sow productivity, and growth and carcass characteristics of the progeny

2000 ◽  
Vol 80 (2) ◽  
pp. 281-286 ◽  
Author(s):  
B. F. Wolter ◽  
D. N. Hamilton ◽  
M. Ellis
Keyword(s):  
Birth Weight ◽  
Growth Performance ◽  
Reproductive Performance ◽  
Carcass Characteristics ◽  
The Other ◽  
Reproductive Efficiency ◽  
Gestation Length ◽  
Female Line ◽  
Female Genotype ◽  
Eye Depth

The reproductive performance over five parities of two one-quarter Meishan female genotypes were compared with a three-breed cross female genotype based on conventional breeds of pigs. Hampshire-sired progeny from these females were evaluated for growth performance and carcass measures. The female genotypes evaluated were Landrace × (Meishan × Yorkshire) (LMeY) (n = 45), Duroc × (Meishan × Yorkshire) (DMeY) (n = 41), and Landrace × (Duroc × Yorkshire) (LDY) (n = 50), respectively. LMeY had a greater number of pigs born alive (11.1, 10.6, and 10.2, SE = 0.24 for LMeY, DMeY, and LDY, respectively, P < 0.05) and a higher total litter birth weight (20.02, 18.16, and 17.29, SE = 0.383 kg for LMeY, DMeY, and LDY, respectively, P < 0.001) than the other lines. Gestation length was reduced for the two Meishan-cross genotypes (114.5, 114.3, and 114.9, SE = 0.18, for LMeY, DMeY and LDY, respectively; P < 0.001). A shorter farrowing interval was observed for the LMeY (147.1, 148.6 and 151.4, SE = 1.32 for LMeY, DMeY and LDY, respectively, P < 0.05). Number of pigs weaned per litter was highest for LMeY line (10.7, 10.0, and 9.4, SE = 0.22 for LMeY, DMeY and LDY, respectively; P < 0.05). No differences (P > 0.05) were observed between the Hampshire-sired progeny of the three dam genotypes for growth performance, backfat thickness and loin eye depth at 114 kg. These results indicate that the development of a female line with one-quarter Meishan may result in improved reproductive efficiency compared to female lines based on western breeds. Key words: Pigs, crossbred, Meishan, reproductive performance, growth performance

Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions

2017 ◽  
Vol 5 (3) ◽  
pp. 91-96 ◽  
Author(s):  
José Romero Alexandre Alves ◽  
◽  
Thiago Antunes Adriano de Andrade ◽  
Daniel de Medeiros Assis ◽  
Thyago Araújo Gurjão ◽  
...  
Keyword(s):  
Heat Stress ◽  
Reproductive Performance ◽  
Stress Conditions ◽  
Performance Behavior

The effects of time and dose of pregnant mare serum gonadotropin (PMSG) on reproductive efficiency in hair sheep ewes

2011 ◽  
Vol 43 (8) ◽  
pp. 1567-1573 ◽  
Author(s):  
Juan A. Quintero-Elisea ◽  
Ulises Macías-Cruz ◽  
Francisco D. Álvarez-Valenzuela ◽  
Abelardo Correa-Calderón ◽  
Arnoldo González-Reyna ◽  
...  
Keyword(s):  
Reproductive Efficiency ◽  
Hair Sheep ◽  
Pregnant Mare Serum Gonadotropin ◽  
Serum Gonadotropin

Impact of lighting regimes on reproductive performance and sperm ultrastructure in rabbit bucks under very severe heat stress conditions

2021 ◽  
pp. 104780
Author(s):  
Sara Fikry Fouda ◽  
Ali Ali El-Raghi ◽  
Abdel-Khalek E. Abdel-Khalek ◽  
Mahmoud A. Hassan ◽  
Ibrahim Talat El-Ratel
Keyword(s):  
Heat Stress ◽  
Reproductive Performance ◽  
Stress Conditions ◽  
Sperm Ultrastructure ◽  
Severe Heat Stress
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