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The guinea pig (Cavia porcellus) is a favorite friend animal and a research model that is common.

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The guinea pig (Cavia porcellus) is a favorite friend animal and a research model that is common.

Key Points

  • Intact guinea that is female are “sows” and intact males are “boars”.
  • Mature boars have actually distinct scrotal pouches and testes that are large.
  • Male guinea pigs have a few accessory intercourse glands, including big, paired seminal vesicles or vesicular glands, which are often seen erroneously as uterine horns.
  • Puberty does occur at around 2 months in females and between 2-3 months in men.
  • The symphysis that is pubic within the last times of maternity.
  • Separation associated with the pubic symphysis may be insufficient in sows bred after 7-8 months of age and dystocia can lead to him or her. Other prospective factors behind dystocia include obesity and fetal size that is large.
  • Sows usually give delivery to 2-4 big, precocial pups. Other rodent types generally speaking have actually big litters.
  • Pregnancy toxemia is a cause that is important of mortality in guinea pigs. This problem is oftentimes seen in primiparous, overweight sows in belated gestation. The prognosis is frequently guarded. Minmise the danger of maternity toxemia by motivating exercise, preventing obesity, and minimizing stress in the sow that is pregnant.
  • Unilateral or bilateral ovarian cysts are common, especially in older sows.
  • Ovariohysterectomy or ovariectomy is advised to avoid the growth of ovarian cysts along with other reproductive dilemmas in non-breeding friend sows.

Introduction

Guinea pigs are of help in reproductive studies since they share numerous traits that are reproductive humans (Fig 1). 26 Like people, guinea pigs possess a hemochorial placenta, by which maternal bloodstream will come in direct connection with the fetal chorion, also comparable trophoblast invasion patterns and uterine vasculature that is comparable. 20 , 23 , 26 The guinea pig’s gestation duration can be split into trimesters, analogous into the human being condition. 26 needless to say, some top features of guinea pig reproductive anatomy and physiology are distributed to other people in purchase Rodentia, as well as other features are unique for this unique species. This short article ratings physiology and physiology associated with guinea pig tract that is reproductive summarizes some clinically significant medical dilemmas.

Figure 1.Guinea pigs (Cavia porcellus) are of help in a lot of studies that are reproductive.

Intact guinea that is male, or “boars”, enter puberty between 70-90 times, but men start to show intimate behavior, such as for example mounting, at four weeks of age. 9 , 17 , 23 At 2 months, boars start to ejaculate while mounting. 23 Expression of intimate behavior and development that is physical somewhat suppressed in the event that boar is housed using its mom and/or siblings. 11

Boars are usually bigger than females, with both sexes having a solitary couple of inguinal mammae. 5 Mature boars possess big, paired testes, that are found on either part associated with the perineum in distinct, superficial scrotal sacs (Fig 2). 5 , 9 , 23 The testicles are frequently completely descended in to the scrotum by 81 times. 2 In the event that testes have never descended by 4 months of age, the guinea pig is highly recommended cryptorchid. 9 The inguinal canals remain open for a lifetime. 9 , 19 to avoid herniation post-castration, many clinicians use a shut method or a modified available strategy, where in fact the tunica is roofed within the suture which is used to connect from the spermatic cable and vessels. 32

Figure 2.Gross image associated with the testicle (arrow) in an adult boar (Cavia porcellus). The epididymis lies across the dorsolateral area regarding the testis. The end for the epididymis offers increase to your ductus deferens. Credit: Drury Reavill, DVM, DABVP (Avian Training), DACVP. Click image to expand.

Clinical Suggestion: Although big, paired testes are unmistakeable in mature boars, sex identification may be challenging in young pups. In the event that testicles aren’t apparent, sexing are facilitated by putting pressure that is gentle the beds base for the prepuce to partially extrude your penis. 23

The penis that is s-shaped of the human anatomy and glans. Guinea pigs have an os penis, that is discovered in the dorsal area for the whole period of the glans. 9 , 19 Like many hystricomorph rodents, your penis even offers moment, saw-toothed white spurs arranged dorsolaterally in 2 synchronous lines through the urethral orifice to your glans. Additionally there is an intromittent sac on the ventral area for the glans penis. 9 During erection, the sac everts and two styles that are horny. 5 , 9 , 23 the big event of the 3-5 mm projections that are long unknown. 9

Male reproductive glands include the seminal vesicles (vesicular glands), coagulating glands, bulbourethral glands, while the prostate (Fig 3). 5 , 27 A rudimentary gland that is preputial additionally be contained in the boar. 9

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