The ram as a model for behavioral neuroendocrinology

Perkins, Anne E.; Roselli, Charles E.

doi:10.1016/j.yhbeh.2007.03.016

Cited by 63 publications

(52 citation statements)

References 62 publications

(68 reference statements)

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“…Although Perkins and Roselli (2007) reported that some sexually inactive rams would begin to copulate if provided with additional opportunities, the results of the present study demonstrated that sexual performance tests did not improve the sexual activity of young bucks (P = 0.427) (data are not given). This finding is in line with the finding that bucks do not require sexual experience with estrus females to reach complete serving capacity (Price et al, 1998).…”

Section: Discussioncontrasting

confidence: 88%

“…Serving capacity and sexual performance tests can be used to predict pasture-mating efficiency in rams (Perkins and Roselli, 2007). However, these types of test are not common practices for small ruminants and there is less interest and fewer studies associated with sexual performance in goats compared with other livestock species (Flores et al, 2000;Darwish and Mahboub, 2011;Moghaddam et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Testosterone concentration is known to affect spermatogenesis, the expression of sexual behavior, and secondary sexual traits (Roselli et al, 2002;Perkins and Roselli, 2007). However, the factors affecting the variation in peripheral testosterone concentration are not well understood.…”

Section: Introductionmentioning

confidence: 99%

“…Sexual performance can vary depending on experience, age, and time of first exposure to estrus female (Perkins and Roselli, 2007). Previous studies have indicated that older males had higher ejaculation efficiency (Kridli and Said, 1999;Price et al, 1991) and shorter reaction time (Darwish and Mahboub, 2011) than younger rams and bucks.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between physiological and behavioral responses of goat bucks in mating season

et al. 2016

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-The objective of this study was to determine the sexual parameters in young bucks with different sexual activity and the effect of experience (age) on sexual parameters in bucks. Fifteen young, sexually inexperienced (SI) and five adult, sexually experienced (SE) Saanen × Hair goat crossbred bucks were used in this study. Bucks were individually exposed to three estrus does for 15-min periods during four sexual performance tests, which were carried out every other day to determine some sexual behavior traits such as flehmen response, reaction time, and ejaculation efficiency. Sexually inexperienced young bucks were evaluated based on their sexual activity (active (AC) vs inactive (IA)) and presence of horn. It was found that AC bucks had significantly higher serum testosterone concentrations (31.5 vs 21.5 ng/mL) and weight loss (114.2 vs 51.2 g/day) than IA bucks. In addition, weight loss was significantly correlated with ejaculation efficiency in young bucks. On the other hand, horned bucks tended to have higher ejaculation efficiency with significantly longer reaction time than polled bucks. For experience (age) classes, SE bucks had higher testosterone concentration (76.0 vs 31.5 ng/mL) and weight loss (16.7 vs 8.6%) than SI active young bucks. However, the effect of experience on other sexual performance traits was found to be limited. Overall, these results indicate that testosterone concentration may affect sexual performance of young bucks in the mating season. Age-related sexual experience is not a determining factor for sexual performance in bucks. However, sexual performance data alone may not reflect reproductive outcomes without semen data.

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Section: Discussioncontrasting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relationships between physiological and behavioral responses of goat bucks in mating season

et al. 2016

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“…$ These two authors contributed equally. Roselli, 2007;Pfaus and Heeb, 1997;Kollack-Walker and Newman, 1995;Heeb and Yahr, 1996;Wade and Arnold, 2004), and we limit our discussion to the hormonal control of mating and aggression in male mice. Testosterone is required in a reversible manner in adult rodents for the display of male typical behaviors.…”

mentioning

confidence: 99%

A genetic approach to dissect sexually dimorphic behaviors

Juntti

Coats

Shah

2008

Hormones and Behavior

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It has been known since antiquity that gender-specific behaviors are regulated by the gonads. We now know that testosterone is required for the appropriate display of male patterns of behavior. Estrogen and progesterone, on the other hand, are essential for female typical responses. Research from several groups also indicates that estrogen signaling is required for male typical behaviors. This finding raises the issue of the relative contribution of these two hormonal systems in the control of male typical behavioral displays. In this review we discuss the findings that led to these conclusions and suggest various genetic strategies that may be required to understand the relative roles of testosterone and estrogen signaling in the control of gender specific behavior.All animals exhibit sex differences in behavior that are characteristic of the species. Such gender typical behaviors are often used to court mates, to defend territory and other resources, and to procure food for mates and offspring. These sexual dimorphisms in behavior are often innate and can be displayed without prior social experience or training, suggesting that the neural circuits that mediate these behaviors are developmentally hardwired in the brain. Nevertheless, the display of these behaviors is tightly regulated by external sensory cues as well as internal physiological regulators such as hormones. Such dual control ensures that animals engage in these behaviors only at the appropriate time and circumstance. While we have learned much about the sensory and hormonal control of sexually dimorphic behaviors (Morris et

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Weak Negative Selection Pressures on Same-Sex Attraction Across Time

Apostolou

2020

The Evolution of Same-Sex Attraction

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The ram as a model for behavioral neuroendocrinology

Cited by 63 publications

References 62 publications

Relationships between physiological and behavioral responses of goat bucks in mating season

Relationships between physiological and behavioral responses of goat bucks in mating season

A genetic approach to dissect sexually dimorphic behaviors

Weak Negative Selection Pressures on Same-Sex Attraction Across Time

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