Consulta: subjectFacets:"Puberty"
Registros recuperados: 11
Data/hora: 10/06/2024 17:01:02

Reproductive responses of the male Brandt’s vole, Lasiopodomys brandtii (Rodentia: Cricetidae) to tannic acid
Provedor de dados: 103
Autores: Dai,Xin; Zhou,Ling-Yu; Xu,Ting-Ting; Wang,Qiu-Yue; Luo,Bin; Li,Yan-Yu; Gu,Chen; Li,Shi-Ping; Wang,Ai-Qin; Wei,Wan-Hong; Yang,Sheng-Mei.
ABSTRACT Tannins are polyphenols that are present in various plants, and potentially contain antioxidant properties that promote reproduction in animals. This study investigated how tannic acid (TA) affects the reproductive parameters of male Brandt’s voles, Lasiopodomys brandtii (Radde, 1861). Specifically, the anti-oxidative level of serum, autophagy in the testis, and reproductive physiology were assessed in males treated with TA from the pubertal stage. Compared to the control, low dose TA enhanced relative testis and epididymis weight and sperm concentration in the epididymis, and significantly increased the level of serum superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px). mRNA levels of autophagy related genes LC3 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidative; Autophagy; Puberty; Reproduction.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702020000100319

Leptin and insulin in the seminal plasma of zebu bulls in peripuberty
Provedor de dados: 96
Autores: Souza,Fernando Andrade; Martins,Jorge André Matias; Vale Filho,Vicente Ribeiro do; Andrade,Venício José de; Ferreira,Marcos Brandão Dias; Emerick,Lucas Luz; Pinto,Pablo Fabricio Bruno; Leite,Ticiano Guimarães.
In order to determine the profile of leptin and insulin values in seminal plasma and their correlations with sperm patterns during the peripuberty, a total of 16 crossbred Gyr dairy bulls were monitored from 60 days before to 60 days after puberty, separated into two groups, early and regular, according to the onset of puberty. Hormone values were determined by radioimmunoassay after gel filtration in fast performance liquid chromatography and semen patterns, according to the Brazilian College of Animal Reproduction. Insulin concentrations in seminal plasma did not differ between groups, nor between the ages, with the pooling of the data showing average of 35.15±16.93, 36.60±26.21, 26.82±09.81, and 43.56±31.71 32.24±16.71 U/mL for the pubertal period of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gyr dairy bulls; Puberty; Sperm defect.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000400013

Effect of high energy intake on carcass composition and hypothalamic gene expression in Bos indicus heifers
Provedor de dados: 96
Autores: Diniz-Magalhães,Juliane; Mesquita,Lígia Garcia; Carvalho,Marina Vieira de; Machado,Anna Beatriz Escarpellin; Pimentel,José Rodrigo Valim; Prada e Silva,Luis Felipe.
ABSTRACT The objective of this study was to evaluate the effect of high or low energy intake on carcass composition and expression of hypothalamic genes related to the onset of puberty. Twenty-four prepubertal Nellore heifers, 18-20- months-old, with 275.3±18.0 kg body weight (BW), and 4.9±0.2 (1-9 scale) body condition score (BCS) were randomly assigned to two treatments: high-energy diet (HE) and low-energy diet (LE). Heifers were housed in two collective pens and fed diets formulated to promote average daily gain of 0.4 (LE) or 1.2 kg (HE) BW/day. Eight heifers from each treatment were slaughtered after the first corpus luteum detection - considered as age of puberty. The 9-10-11th rib section was taken and prepared for carcass composition analyses....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Energy supplementation; Neuropeptides; Puberty; Reproduction.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000800664

The effect of feed supplementation on the onset of puberty in Brazilian dairy heifers
Provedor de dados: 63
Autores: Meirelles,C.F.; Abdalla,A.L.; Vitti,D.M.S.S.
Most Brazilian dairy production is conducted by small holders whose general management skills and feeding programs are often deficient. One common problem directly attributed to underfeeding is that heifers rarely reach sexual maturity before 15 months of age. Groups of growing heifers were treated to detect the effects of protein supplementation and antihelmintic treatment on sexual maturity. The first ovulation occurred at 513 ± 44 and 573 ± 36 days (P&lt;.01) in supplemented and control groups, respectively. Liveweight gains from start of the trial to the first ovulation were 378 ±.02 and 331 ±.04 g for suplemented (S) and control (C) groups. Only 52.17 % of heifers in C group (11 of 23) but 95.65 % in S group (22 of 23) reached sexual maturity before...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heifers; Puberty; Protein supplementation; Antihelmintic.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200026

The stimulatory effect of male agouti (Dasyprocta prymnolopha) on the onset of female puberty
Provedor de dados: 36
Autores: Guimarães,Diva Anelie de Araújo; Ramos,Rosemar Silva Luz; Garcia,Gary Wayne; Ohashi,Otávio Mitio.
The objective of this research was to analyze female agouti puberty. We did not observe the onset of puberty when the females were raised without males. When an adult male was put together with other adults and no cycling females, the onset of estrous cycle was observed after 10 to 60 days. When the young females were raised with a male, the onset of puberty was reached at 9 months. We concluded that the male agouti influences the onset of puberty in females, and that the dominant female, apparently, inhibits or delays the puberty of the other agouti females of the group. We suggest further studies be made concerning the social control of the reproduction of these animal.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agouti; Reproduction; Puberty; Estrous cycle; Captivity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000400004

Experimental exposure to 3-monochloropropane-1,2-diol from the pre-puberty causes damage in sperm production and motility in adulthood
Provedor de dados: 3
Autores: Vieira, Kátia Cristina Melo Tavares; Favareto, Ana Paula Alves.
3-Monochloropropane-1,2-diol (3-MCPD) is a food contaminant that can be formed during the thermic processing of various foodstuffs. Studies of reproductive toxicology of 3-MCPD are mainly concentrated in the evaluation of possible insults caused by exposure of adult animals. However, the prepuberty might be a period of different susceptibility to chemicals. The aim of this study was to evaluate the effects on reproductive endpoints of the 3-MCPD-exposure prepubertal male rats. Wistar male rats were assigned to 4 groups: control and exposed to 2.5; 5 or 10 mg kg-1 day-1 of 3-MCPD for 30 days by gavage. Testis and epididymis were used for sperm counts and histology analysis. Sertoli cell number and dynamic of the spermatogenesis were evaluated. Sperm were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.06.00.00-3 monochloropropanol; Puberty; Rats; Spermatogenesis; Reproduction. Morfologia.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31323

Secretory Patterns of Leptin and Luteinizing Hormone in Food-Restricted Young Female Sheep
Provedor de dados: 48
Autores: RECABARREN,SERGIO E; LOBOS,ALEJANDRO; TORRES,VERÓNICA; OYARZO,ROBERTO; SIR-PETERMANN,TERESA.
Leptin, the product of the ob gene, has been proposed as a metabolic signal that regulates the secretion of GnRH/LH. This may be critical during prepubertal development to synchronize information about energy stores and the secretion of GnRH/LH. This study aimed to assess the effect of food restriction on the episodic secretion of leptin and LH in young female sheep. Five 20-week-old prepubertal females were fed a low-level diet for 10 weeks to maintain the body weight. Control females of the same age received food ad libitum. Blood samples were collected at 10-min intervals for six hours at 20, 26, and 30 weeks of age, and plasma leptin, LH, insulin and cortisol concentrations were measured. In the control group, no changes were found in pulsatile LH...
Tipo: Journal article
Palavras-chave: Female sheep; Food restriction; Leptin; LH; Puberty.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000300003

Aspectos relacionados à precocidade sexual em bovinos machos da raça Nelore, PO
Provedor de dados: 52
Autores: Silva,Antonio E. D. Feliciano; Unanian,Maria M.; Silva,Alzira Roza e.
O estudo foi desenvolvido em 79 bovinos machos da raça Nelore, PO, de dez a 16 meses de idade. Em todos os animais foram medidas a circunferência escrotal (CE), a concentração de testosterona (Testo) e o aparecimento dos primeiros espermatozoides no ejaculado. Os resultados indicaram que 18,5 % dos machos em estudo apresentaram os primeiros espermatozoides aos 306,17± 2,42 dias de idade, 19,75± 0,9 cm de circunferência escrotal, e uma concentração de testosterona de 1,57± 0,9 ng/ml. Após o aparecimento dos primeiros espermatozoides no ejaculado, os machos mostraram a puberdade aos 365,39± 1,13 dias e a maturidade aos 487,38± 3,08 dias. Estes resultados indicam que existem machos na raça Nelore, PO que iniciam a atividade sexual em idades inferiores às...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age of first spermatozoa; Scrotal circumference; Puberty; Bovine; Nelore breed.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400016

Animal model for age- and sex-related genotoxicity of diethylstilbestrol
Provedor de dados: 56
Autores: Fučić,A.; Stojkovic,R.; Katić,J.; Markovic,D.; Ferencic,Z.; Koršić,M.; Jazbec,A.M.; Gamulin,M.
Environmental xenoestrogens pose a significant health risk for all living organisms. There is growing evidence concerning the different susceptibility to xenoestrogens of developing and adult organisms, but little is known about their genotoxicity in pre-pubertal mammals. In the present study, we developed an animal model to test the sex- and age-specific genotoxicity of the synthetic estrogen diethylstilbestrol (DES) on the reticulocytes of 3-week-old pre-pubertal and 12-week-old adult BALB/CJ mice using the in vivo micronucleus (MN) assay. DES was administered intraperitoneally at doses of 0.05, 0.5, and 5 µg/kg for 3 days and animals were sampled 48, 72 and 96 h, and 2 weeks after exposure. Five animals were analyzed for each dose, sex, and age group....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diethylstilbestrol; Estrogen; Puberty; In vivo micronucleus assay; Sex; Genotoxicity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001100015

Clinical and molecular analysis of human reproductive disorders in Brazilian patients
Provedor de dados: 56
Autores: Latronico,A.C.; Costa,E.M.F.; Domenice,S.; Correa,R.V.; Kohek,M.B.F.; Arnhold,I.J.P.; Mendonca,B.B.
Several genes that influence the development and function of the hypothalamic-pituitary-gonadal-axis (HPG) have been identified. These genes encode an array of transcription factors, matrix proteins, hormones, receptors, and enzymes that are expressed at multiple levels of the HPG. We report the experience of a single Endocrinology Unit in the identification and characterization of naturally occurring mutations in families affected by HPG disorders, including forms of precocious puberty, hypogonadism and abnormal sexual development due to impaired gonadotropin function. Eight distinct genes implicated in HPG function were studied: KAL, SF1, DAX1, GnRH, GnRHR, FSHß, FSHR, and LHR. Most mutations identified in our cohort are described for the first time in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypogonadism; Puberty; Gonadotropins; Genetic mutation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000100019

Reproductive ability of pubertal male and female rats
Provedor de dados: 56
Autores: Zemunik,T.; Peruzovic,M.; Capkun,V.; Zekan,L.; Tomic,S.; Milkovic,K.
Ten Fisher rats 50 to 55 days of age made up the pubertal group, and ten rats 90 to 95 days of age served as the controls. The testicular and epididymal weights and volumes of the pubertal males were lower than those of the controls (P&lt;0.001). There was also a difference in relative epididymal weight (P&lt;0.001). The sperm of pubertal males was morphologically abnormal in 58.2% of cases, as opposed to only 3.8% in the controls (P&lt;0.001). The mean number of spermatozoa in the control group was 11.9 × 10(6)/ml and their viability was 99.6%, while these values could not be determined for pubertal rats. Serum testosterone was higher in the pubertal animals than in the controls (2.52 ± 1.46 vs 0.92 ± 0.34 nM, P&lt;0.01). The ovaries of control females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Puberty; Reproduction; Gonads; Sex hormones; Pregnancy.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000700007