Seasonal changes in fecal testosterone concentrations and their relationship to the reproductive behavior, antler cycle and grouping patterns in free-ranging male Pampas deer (Ozotoceros bezoarticus bezoarticus)

Pereira, Ricardo José Garcia; Duarte, José Maurício Barbanti; Negrão, João Alberto

doi:10.1016/j.theriogenology.2004.08.014

Cited by 55 publications

(48 citation statements)

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“…Segundo Pereira e Duarte (2005), existe correlação significativa entre concentrações de testosterona e comportamento reprodutivo, razão pela qual o ciclo sazonal desse hormônio modula o comportamento sexual dos machos durante o período de acasalamento, quando somente indivíduos com os chifres expostos demarcam o seu território.…”

Section: Resultsunclassified

Morfometria corpórea, características do sêmen, proteínas seminais e testosterona em cervos Cervus unicolor, em cativeiro

Chacur

Martins

Silva

et al. 2014

Arq. Bras. Med. Vet. Zootec.

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RESUMOObjetivou-se estudar a morfometria corpórea, as características do sêmen, o perfil proteico do plasma seminal em SDS-PAGE e a concentração sérica de testosterona em cervos-sambar (Cervus unicolor), criados em cativeiro, na estação reprodutiva da primavera. Quatro machos com idades entre 12 e 36 meses foram avaliados em quatro momentos, com intervalos de sete dias, com peso corpóreo (60,5 a 89,0kg), índice de massa corporal (93,07kg/m 2 a 126,56kg/m 2 ), volume do ejaculado (0,50±0,35mL a 0,75±0,28 mL), motilidade espermática (87,75±4,78% a 90,00±7,07%), defeitos totais (17,25±5,81% a 47,72±17,55%), testosterona sérica (6,43±4,33ng/dL a 166,00±64,48ng/dL) e proteínas do plasma seminal com bandas entre 7,6 e 142kDa. As características dos ejaculados não diferiram (P>0,05) entre as três primeiras colheitas. Houve diferença (P<0,05) para os defeitos espermáticos com elevação na quarta colheita. No plasma seminal de cada cervo, foram identificadas de 16 a 27 bandas de proteínas entre 7,6 e 142kDa. Conclui-se que a qualidade espermática foi satisfatória na primavera. O estresse das contenções sucessivas causou queda da qualidade espermática. A idade influi na concentração sérica de testosterona, a qual foi maior nos cervos aos 36 meses.Palavras-chave: Cervidae, cativeiro, sêmen, SDS-PAGE, andrógeno (60.5 to 89.0kg), body mass index (93.07 to 126.56kg/m 2 ), ejaculate volume (0.50±0.35mL to 0.75±0.28mL), sperm motility (87.75±4.78% to 90.00±7.07% ), total defects (17.25±5.81% to 47.72±17.55%), serum testosterone (6.43±4.33 ng/dL to 166.00±64.48ng/dL) ABSTRACT The aim of this work was to study the body morphometry, semen characteristics, seminal plasma protein profile in SDS-PAGE and serum testosterone concentration in Sambar Deer (Cervus unicolor), in captivity in the breeding season (spring). Four males aged between 12 and 36 months were assessed in four moments with intervals of seven days with body weight

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Section: Resultsunclassified

Morfometria corpórea, características do sêmen, proteínas seminais e testosterona em cervos Cervus unicolor, em cativeiro

Chacur

Martins

Silva

et al. 2014

Arq. Bras. Med. Vet. Zootec.

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“…O aumento no número de fêmeas isoladas em maio e em outubro foi observado por NETTO et al (2000). (BIANCHINI & LUNA-PEREZ, 1972a;GONZALES-SIERRA, 1985;JACKSON, 1986;JACKSON & LANGGUTH, 1987;GONZALEZ, 1994;RODRIGUES, 1996;DUARTE, 1997;BRAGA et al, 2000;PEREIRA et al, 2005;PEREIRA et al, 2006;LACERDA, 2008), como sendo restrita ao período de inverno.…”

Section: Resultsunclassified

Estimativas de parâmetros populacionais e demográficos de Ozotoceros bezoarticus (Artiodactyla, Cervidae) em Piraí do Sul, Paraná, sul do Brasil

Braga¹,

Kuniyoshi

2010

Iheringia, Sér. Zool.

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ABSTRACT. Estimates of population and demographic parameters of Ozotoceros bezoarticus (Artiodactyla, Cervidae) in Piraí do Sul, Paraná, southern Brazil. This study was conducted in two private properties in the municipality of Piraí do Sul (Paraná state, southern Brazil). Sixteen monthly visits were made each one lasting three days between February 2001 and May 2002. The study aimed at the observation of pampas deer biology (Ozotoceros bezoarticus Linnaeus, 1758), and the evaluation of main impacts to this population. We computed 1,065 observations of estimated 71.45 individuals. The average size of the groups was 2.29 (SD + 0.55) animals, and the sexual ratio was 0.83. Isolated deer accounted for 40% of the observations, whereas the largest group comprised 10 individuals. It was recorded a peack period of births between September and November, although births were observed along all the studied period. Thirty-four deaths were recorded corresponding to a 47.6% death rate. The main causes of death were predatory actions by cougar Puma concolor (Linnaeus, 1771), hunting and individuals being run over by motor vehicles. The studied population is seriously endangered and it will not escape extinction unless certain policies to guarantee its conservation are adopted. These policies should include correct management of the areas and control of pressure vectors. KEYWORDS. Pampas deer, sexual ratio, conservation, population threats.RESUMO. Este estudo foi realizado em duas propriedades particulares, situadas no município de Piraí do Sul, sul do Brasil. Foram realizadas 16 fases de campo mensais, com três dias de duração, no período compreendido entre fevereiro de 2001 e maio de 2002, com o objetivo de obter informações sobre a biologia do veado-campeiro (Ozotoceros bezoarticus Linnaeus, 1758) e identificar os principais fatores de impacto sobre o mesmo. Foram computadas 1.065 observações, estimando-se 71,45 indivíduos na população, sendo o tamanho médio dos grupos de 2,29 (DV + 0,55), e a razão sexual de 0,83. Indivíduos isolados corresponderam a 40% das observações, sendo o maior grupo composto por 10 indivíduos. Registrou-se um pico de nascimentos entre setembro e novembro, embora esses tenham acontecido ao longo de todo o estudo. Foram registrados 34 óbitos, correspondendo a uma mortalidade de 47,6%, sendo as principais causas a predação por Puma concolor (Linnaeus, 1771), a caça e os atropelamentos. A população estudada encontra-se severamente ameaçada, e não sobreviverá por muito tempo a menos que políticas que garantam a sua conservação sejam adotadas. Estas políticas devem incluir o manejo adequado das áreas e o controle dos vetores de pressão. PALAVRAS-CHAVE.Veado-campeiro, razão sexual, conservação, ameaças populacionais.

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“…Skinner & Harrington (2003) had supportive observations that in a group of Sika Deer the activities directly associated with mating were significantly different between the territorial and non territorial groups. Pereira et al (2005) observed that breeding behaviour of male Pampas Deer during rut was characterized by predominately ano-genital sniffing, flehmen, urine sniffing, chasing and mounting. In this study, good body condition was maintained in the initial phases of the rut season but, during the later stages of rut/hard antler phase, the stags were seen in a worn out condition which is indicative of the hardships undergone during the rut for maintenance of the harem as well as the dominance quotient.…”

Section: Discussionmentioning

confidence: 99%

Observations on Sambar Rusa unicolor (Cetartiodactyla: Cervidae) stags during hard and velvet stages of antler cycle in captivity

Savanth¹,

Saseendran²,

Anil³

et al. 2011

J. Threat. Taxa

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This research was carried out at the State Museum and Zoo, Thrissur, Kerala, India from June to October, 2009. The objective was to observe and record the physical and behavioural changes in Sambar Deer Rusa unicolor stags linked to their territorial display during various stages of the breeding cycle. In total, there were 70 Sambar in the enclosure, at the commencement of the study, of which 22 were males including 16 adult stags. Six stags were selected for the study. Observations were made by focal animal sampling technique. An ethogram was devised and behavioural patterns were indicated on it. The behavioural score derived from the ethogram was significantly higher in stags in their hard antler stage when compared to the stags in the velvet stage. The stags in the hard antler stage were more massive, had bigger antlers, darker coat colour, thicker neck, larger scrotum and maintained a larger 'harem' in comparison to the velvet stage stags which preferred a rather subdued life. The most dominant stags in the hard antler stage had up to 17 female members in his territory. As the stags in velvet entered the rut season, the dominant stag had up to 19 females in his territory. The study is expected to be useful to evolve strategies to identify and reduce a few males not contributing in breeding in any particular enclosure and thus curtail expenses in management of cervids in captivity.

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Seasonal changes in fecal testosterone concentrations and their relationship to the reproductive behavior, antler cycle and grouping patterns in free-ranging male Pampas deer (Ozotoceros bezoarticus bezoarticus)

Cited by 55 publications

References 31 publications

Morfometria corpórea, características do sêmen, proteínas seminais e testosterona em cervos Cervus unicolor, em cativeiro

Morfometria corpórea, características do sêmen, proteínas seminais e testosterona em cervos Cervus unicolor, em cativeiro

Estimativas de parâmetros populacionais e demográficos de Ozotoceros bezoarticus (Artiodactyla, Cervidae) em Piraí do Sul, Paraná, sul do Brasil

Observations on Sambar Rusa unicolor (Cetartiodactyla: Cervidae) stags during hard and velvet stages of antler cycle in captivity

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