Características do ejaculado de caprinos sob estresse calórico em câmara bioclimática

Coelho, Lia de Alencar; Sasa, Aya; Nader, Carlos Eduardo; Celeguini, E.C.C.

doi:10.1590/s0102-09352006000400015

Cited by 9 publications

(3 citation statements)

References 9 publications

(5 reference statements)

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“…According to the descriptions above, testicular heat shock was detrimental to the maintenance of gamete quality, regardless of administration of green tea extract, which is rich in antioxidants (Schmitz et al, 2005), with day 30 representing the moment of maximum impairment. The deleterious action of the high temperature on seminal parameters has been described in previous studies, and evidenced by a reduction in the volume, concentration, morphology, motility, vigor, and plasma membrane integrity of semen samples (Coelho et al, 2006;Ghasemi et al, 2009;Abshenas et al, 2011;Ding et al, 2015). This is a consequence of the sensitivity of testicular germ cells to thermal variations (Absalan et al, 2008).…”

Section: Discussionmentioning

confidence: 83%

Effect of green tea extract (Camellia sinensis) on the spermatic parameters of Wistar rats submitted or not to testicular heat shock

et al. 2020

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The aim of this study was to evaluate the effect of green tea extract (GTE) on the spermatic parameters of Wistar rats, submitted or not to testicular heat shock (HS). For this, 48 animals were treated according to the experimental groups (G1: not exposed to HS and untreated; G2: exposed to HS and untreated; G3: not exposed to HS and treated with GTE; G4: exposed to HS and treated with GTE). Subgroups of rats were euthanized on days 15, 30, and 60 to recover the spermatozoa. The total motility (TM), vigor, spermatic morphology and concentration, mitochondrial membrane potential, plasma membrane integrity, and acrosome integrity (ACi) were analyzed. The TM was higher in G1 and G3 than in G2 and G4 on day 30, and higher in G4 on day 60. The overall means of TM and vigor were higher in G1 and G3 than in G2 and G4, as well as TM on day 60. For the morphology, G2 and G4 were lower than G1 and G3 on day 15, and G4 was lower than G1 and G3 on day 30. Moreover, in G1 and G3 morphology was higher on days 15 and 30, and in G4 it was lower on day 30, with the overall means being higher in G1 and G3 than in G2 and G4, as well as on days 15 and 60 compared to day 30. The overall mean of ACi, on day 30, was lower than on days 15 and 60 for all the groups. Therefore, HS is shown to be widely deleterious to the gametes, and the daily administration of 100 mg/kg green tea extract does not improve the spermatic parameters of Wistar rats, submitted or not to testicular HS, although it leads to better recovery of spermatic motility and morphology at 60 days.

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Section: Discussionmentioning

confidence: 83%

Effect of green tea extract (Camellia sinensis) on the spermatic parameters of Wistar rats submitted or not to testicular heat shock

et al. 2020

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“…Remarkably, the gradual increase in scrotal circumference occurred in alternating periods of significant growth and stability from the 14th to 32nd weeks (Table 4), which is similar to the observations made in native Brazilian goats (Eloyand Santa Rosa, 1998). Even after reaching sexual maturity, changes in scrotal circumference can occur in goats due to the influence of photoperiod, nutritional status, and temperature (Coelho et al, 2006;Almeida et al, 2007;Delgadillo et al, 2007). As age increased, a high positive correlation was observed between live weight and scrotal circumference (r = 0.847).…”

Section: Discussionmentioning

confidence: 99%

Determinants of puberty and age of sexual maturity in Nigerian indigenous breeds of male goats

Bitrus,

Nnadi,

Makun

et al. 2023

dujopas

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This study was conducted to ascertain the pubertal and sexual maturity characteristics of Nigerian native goat breeds. The research was carried out on three goat breeds; Sahel (SG), Red Sokoto (RSG), and West African Dwarf (WAD) goats. Each breed was represented by eight (8) animals (n=24) and housed in separate pens based on breed type. All bucks were weighed at birth and bi-weekly using digital weighing scales until they reached puberty. Scrotal circumference measurements were taken every two weeks until the end of the study. Semen was collected immediately after preputial separation and all semen samples were labelled and placed in a thermo-flask immediately and subsequently transported to the laboratory for evaluation. The mass motility and the forward motilities of the spermatozoa were observed using a light microscope. The percentage of live, dead, and abnormal sperms were determined after staining with eosin and negrosin stains. The sperm cell concentration was determined by counting spermatozoa with a hemocytometer. Result obtained indicate that at the 14th and 16th weeks of age, the mean scrotal circumference of bucks ranged from 5.14±0.66 cm to 7.06±0.71 cm, 6.32±0.29 cm to 8.05±0.42 cm, and 5.50±0.74 cm to 7.06±0.71 cm in SG, RSG, and WAD bucks, respectively. Puberty in Red Sokoto bucks was achieved at an average age of 14 weeks, with a mean sperm concentration of (116.17±28.47 x 106), progressive sperm motility of (65.00±9.92%), and a mean body weight of 10.17±1.26 kg. Sahelian and WAD bucks reached puberty at the 16th weeks, with sperm concentrations of 106.29±25.18 x 106 and 107.60±19.99 x 106, mean sperm motility of 65.00±9.94% and 76.00±4.8%, and mean body weights of 11.29±1.59 kg and 7.78±0.70 kg, respectively. To summarise, this study revealed that breed, age, scrotal circumference and body weight at puberty played significant roles in determining sperm characteristics and sexual maturity.

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“…Em pesquisa, Coelho (2006) constatou que o estresse calórico influenciou a temperatura testicular, provocando elevação média de 1,5°C ao final do tratamento. Essa característica também variou em função da raça, sendo os valores mais elevados na Saanen em relação a Pardo Alpina.…”

Section: Alterações Reprodutivasunclassified

Efeitos Do Estresse Térmico Sobre a Fisiologia, Produção E Reprodução De Caprinos

Viana¹,

Medeiros²,

Souza

2013

AGROPECUÁRIA NO SEMIÁRIDO

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Este trabalho tem como objetivo fazer uma revisão de literatura sobre as alterações fisiológicas causadas pelo estresse térmico em caprinos. Foram analisadas revisões de literatura e artigos científicos de diversos autores e em diversas localidades, sendo a principal delas a região Nordeste, por ser uma área onde o setor agropecuário, e principalmente a caprinocultura, tem grande importância econômica na agricultura de subsistência. A pesquisa permitiu a confirmação de alterações diversas, tais como na composição do leite, nas características seminais, hormonais, frequência respiratória, o volume-minuto respiratório, a termólise-evaporativa respiratória, temperatura retal e taxa de sudorese. Com isso, é possível concluir que o estresse térmico influencia produtiva e reprodutivamente a caprinocultura, confirmando a necessidade de buscar métodos ou atitudes que diminuam a influência das temperaturas e permitam uma melhor produtividade para esses animais.

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Características do ejaculado de caprinos sob estresse calórico em câmara bioclimática

Cited by 9 publications

References 9 publications

Effect of green tea extract (Camellia sinensis) on the spermatic parameters of Wistar rats submitted or not to testicular heat shock

Effect of green tea extract (Camellia sinensis) on the spermatic parameters of Wistar rats submitted or not to testicular heat shock

Determinants of puberty and age of sexual maturity in Nigerian indigenous breeds of male goats

Efeitos Do Estresse Térmico Sobre a Fisiologia, Produção E Reprodução De Caprinos

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