scholarly journals Resposta reprodutiva na apresentação de zelagem, fertilidade e prolificidade em ovelhas pelibues, sincronizadas com FGA, P4, PMSG e efeito masculino / Reproductive response on the presentation of zeal, fertility and prolificity in pelibuey sheep, synchronized with FGA, P4, PMSG and male effect

2021 ◽  
Vol 4 (3) ◽  
pp. 3465-3470
Author(s):  
Rodolfo Lucio Domínguez ◽  
Leticia Sesento Garcia ◽  
Carlos Bedolla Cedeño ◽  
Ángel Raúl Cruz Hernández
Keyword(s):  
Male Effect ◽  
Reproductive Response ◽  
Pelibuey Sheep

A aplicação do efeito macho (E.M.) como substituto do PMSG em ovelhas tratadas com esponjas vaginais FGA, com o objetivo de induzir e sincronizar o calor das ovelhas sem aumentar excessivamente a prolificidade, reduzindo assim o custo do tratamento. Para tanto, foram utilizadas 60 ovelhas da raça pelibuey, divididas aleatoriamente em três grupos: grupo 1 (Controle): o protocolo foi o clássico, utilizando uma esponja APG vaginal em dose normal (40 mg, Cronogest®, Intervet) durante 11 dias. PMSG (500 IU.IM.) foi injetado 2 dias antes (dia 9) da remoção da esponja. O grupo foi mantido isolado dos machos até o dia do acasalamento dirigido. Grupo 2: apenas ½ esponja FGA (20mg. Cronogest®, Intervet) sem PMSG foi usada. No dia 5 foi injetada progesterona (25mg, IM em solução oleosa) e no dia 8 o "efeito masculino" foi causado. Grupo 3: Com apenas ½ esponja FGA (20mg, Cronogest®, Intervet) também injetando progesterona (25mg, IM em solução oleosa no dia da inserção da esponja) sem PMSG, por 6 dias. Três dias antes (dia 3) da remoção da esponja, o "efeito masculino" foi obtido. Os ovinos dos grupos G1, G2 e G3 não mantinham contato com os machos há 30 dias. Um macho foi usado para detecção de cio e mais dois para acasalamento. O grupo controle foi superior apenas no tempo de apresentação do calor em relação ao G2 e G3 com diferença estatística (p 0,05). Para as variáveis de fertilidade e prolificidade, não houve diferenças significativas (p 0,05) entre os três grupos. Esses resultados demonstram as grandes possibilidades de utilização do efeito macho ao invés do PMSG para sincronização de calor em ovinos.

Switching photo-stimulated males between groups of goats does not improve the reproductive response during the male effect

2014 ◽  
Vol 146 (1-2) ◽  
pp. 21-26 ◽  
Author(s):  
J. Loya-Carrera ◽  
M. Bedos ◽  
J.L. Ponce-Covarrubias ◽  
H. Hernández ◽  
P. Chemineau ◽  
...  
Keyword(s):  
Male Effect ◽  
Reproductive Response

scholarly journals The reproductive response to the male effect of 7- or 10-month-old female goats is improved when photostimulated males are used

animal ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 1658-1665 ◽  
Author(s):  
L.A. Zarazaga ◽  
M.C. Gatica ◽  
H. Hernández ◽  
M. Keller ◽  
P. Chemineau ◽  
...  
Keyword(s):  
Male Effect ◽  
Reproductive Response

scholarly journals Reproductive response of Pelibuey sheep to the application of recombinant bovine somatotropin and a metabolic restorative preparation

2018 ◽  
Vol 53 (12) ◽  
pp. 1392-1398
Author(s):  
Silvia Fraire-Cordero ◽  
Paulino Pérez Rodríguez ◽  
Ponciano Pérez-Hernández ◽  
César Cortez-Romero ◽  
Jaime Gallegos-Sánchez
Keyword(s):  
Body Weight ◽  
Milk Production ◽  
Post Partum ◽  
Reproductive Activity ◽  
Bovine Somatotropin ◽  
Ovarian Activity ◽  
Weight Changes ◽  
Recombinant Bovine Somatotropin ◽  
Reproductive Response ◽  
Pelibuey Sheep

Abstract: The objective of this work was to evaluate the effect of recombinant bovine somatotropin (rBST) and of the metabolic restorative preparation Metabolase (MR) on the reestablishment of the post-partum ovarian activity of Pelibuey sheep. Ninety-four ewes, with their respective lambs, were randomly assigned to one of the following treatments: T1, continuous suckling (CS); T2, CS + MR; T3, CS + rBST; and T4, CS + MR + rBST. Ovulating percentages, weight changes in ewes and lambs, incidence of estrus, onset and return to estrus, calving, fecundity, and prolificacy were evaluated. The highest ovulation percentages were recorded for CS in T1 and T2, and the lowest ones for rBST in T3 and T4. The treatments had a significant effect on lamb weight. Ewes in T3 had the lowest incidence of estrus (52.9%), besides a greater onset (26.8±1.9 hours) and return to estrus (66.6%). Calving (86.2%) and fecundity (1.8±0.2) were significantly higher in T2. The application of rBST in ewes increases lamb body weight, due to increased milk production, but affects negatively post-partum reproductive activity due to the loss of ewe body weight.

scholarly journals Whole blood and blood components from vertebrates differentially affect egg formation in three species of anautogenous mosquitoes

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Ruby E. Harrison ◽  
Mark R. Brown ◽  
Michael R. Strand
Keyword(s):  
Serum Albumin ◽  
Whole Blood ◽  
Digestive Enzyme ◽  
Vertebrate Host ◽  
Cell Protein ◽  
Blood Components ◽  
Blood Proteins ◽  
Serum Albumins ◽  
Egg Formation ◽  
Reproductive Response

Abstract Background Most female mosquitoes are anautogenous and must blood feed on a vertebrate host to produce eggs. Prior studies show that the number of eggs females lay per clutch correlates with the volume of blood ingested and that protein is the most important macronutrient for egg formation. In contrast, how whole blood, blood fractions and specific blood proteins from different vertebrates affect egg formation is less clear. Since egg formation is best understood in Aedes aegypti, we examined how blood and blood components from different vertebrates affect this species and two others: the malaria vector Anopheles gambiae and arbovirus vector Culex quinquefasciatus. Methods Adult female mosquitoes were fed blood, blood fractions and purified major blood proteins from different vertebrate hosts. Markers of reproductive response including ovary ecdysteroidogenesis, yolk deposition into oocytes and number of mature eggs produced were measured. Results Ae. aegypti, An. gambiae and C. quinquefasciatus responded differently to meals of whole blood, plasma or blood cells from human, rat, chicken and turkey hosts. We observed more similarities between the anthropophiles Ae. aegypti and An. gambiae than the ornithophile C. quinquefasciatus. Focusing on Ae. aegypti, the major plasma-derived proteins (serum albumin, fibrinogen and globulins) differentially stimulated egg formation as a function of vertebrate host source. The major blood cell protein, hemoglobin, stimulated yolk deposition when from pigs but not humans, cows or sheep. Serum albumins from different vertebrates also variably affected egg formation. Bovine serum albumin (BSA) stimulated ovary ecdysteroidogenesis, but more weakly induced digestive enzyme activities than whole blood. In contrast, BSA-derived peptides and free amino acids had no stimulatory effects on ecdysteroidogenesis or yolk deposition into oocytes. Conclusions Whole blood, blood fractions and specific blood proteins supported egg formation in three species of anautogenous mosquitoes but specific responses varied with the vertebrate source of the blood components tested.

scholarly journals Does Habitat Diversity Modify the Dietary and Reproductive Response to Prey Fluctuations in a Generalist Raptor Predator, the Eurasian Buzzard Buteo buteo?

Birds ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 114-126
Author(s):  
Marek Panek
Keyword(s):  
Habitat Quality ◽  
Breeding Success ◽  
Common Vole ◽  
Habitat Diversity ◽  
Crop Fields ◽  
Buteo Buteo ◽  
Nestling Diet ◽  
Reproductive Response ◽  
Agricultural Habitat ◽  
Small Fields

Predators can modify their diet and demography in response to changes in food availability and habitat quality. I tested the prediction that some species can change their predation pattern, between specialist type and generalist type, depending on the complexity of habitat structure. It was hypothesized that their dietary response is stronger in diversified habitats than in simplified ones, but the opposite tendency occurs in the case of reproductive response. The nestling diet and breeding success of the Eurasian Buzzard Buteo buteo, the abundance of its main prey (the common vole Microtus arvalis), and that of the most important alternative prey group (passerines) were estimated over ten years in two types of agricultural habitat in western Poland, i.e., in the diversified habitat of small fields and the simplified habitat of large fields. The vole abundance was higher in large fields, but the abundance of passerines was greater in small fields. The frequency of voles in the Eurasian Buzzard nestling diet was higher in large fields than in small fields and increased with the abundance of this prey in crop fields. However, no difference in the relationship between the vole frequency in the diet of Eurasian Buzzards and the abundance of voles was found between the two habitat types. The breeding success of Eurasian Buzzards was dependent on the vole abundance, but this relationship did not differ between the two field types. It seems that the pattern of dietary and reproductive response of Eurasian Buzzards depends on the actual availability of individual prey species, which can be modified by habitat quality, rather than on relative prey abundance.

The presence of small ruminant lentiviruses in Mexican Pelibuey sheep

2016 ◽  
Vol 86 (8) ◽  
pp. 1953-1957.e1 ◽  
Author(s):  
José H. Sánchez ◽  
Humberto A. Martínez ◽  
María M. García ◽  
Germán Garrido ◽  
Luis Gómez ◽  
...  
Keyword(s):  
Small Ruminant ◽  
Pelibuey Sheep ◽  
Small Ruminant Lentiviruses

scholarly journals Regulation of Gonadotropin Secretion in the Male: Effect of an Aromatization Inhibitor in Estradiol-implanted, Orchidectomized Dogs

1986 ◽  
Vol 7 (4) ◽  
pp. 234-239 ◽  
Author(s):  
C. AWONIYI ◽  
T. HASSON ◽  
V. CHANDRASHEKAR ◽  
R. E. FALVO ◽  
B. D. SCHANBACHER
Keyword(s):  
Gonadotropin Secretion ◽  
Male Effect
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