Aspectos biométricos do desenvolvimento testicular e corporal em cutias (Dasyprocta aguti) criadas em cativeiros

Morphological development of the testicles and spermatogenesis in guinea pigs (Cavia porcellus Linnaeus, 1758)

“…The high correlation between these parameters indicated that testicular mass was a quantitative indicator of sperm production by guinea pigs and, therefore, testicular mass may constitute a useful tool for evaluating the sperm production capacity of this species, as described by other authors (FRANÇA and RUSSELL, 1998;JOHNSON, VARNER, ROBERTS et al, 2000). After puberty, testicular development in guinea pigs was similar to that in other mammal and rodent species (COUROT, HOCHEREAUA- DE REVIERS and ORTAVANT, 1970;ASSIS NETO, CARVALHO, MELO et al, 2003a). Highly significant correlation (p < 0.01) between body mass, age and other testicular parameters agreed with Murrah buffalo bulls (LUZ, SANTOS, ANDRIGHETTO et al, 2013) and contrasted to the correlation described only between the testis mass and the length, width and tubule diameter in collared peccary (GUIMARÃES, CARDOSO, FERREIRA et al, 2013) and between testicular mass and length and between testicular mass and width (FRANÇA, SILVA-JUNIOR, CHIARINI-GARCIA et al, 2000;FERREIRA, GUIMARÃES, LUZ-RAMOS et al, 2004;SONNER, MIGLINO, SANTOS et al, 2004;OHASHI, MIRANDA, CORDEIRO et al, 2007).…”

“…Body mass and testicular mass showed, respectively, four and five quick growth points: the first in the early prepuberal phase, the second in the late prepuberal phase, the third in the puberal phase, the fourth, in both body and testicular mass, in the postpuberal 1 phase, and the fifth, only in testis mass, in the postpuberal 1 phase. These periods partially disagree with other domestic mammal species (COUROT, HOCHEREAUA-DE REVIERS and ORTAVANT, 1970) and rodents (COUROT, HOCHEREAUA-DE REVIERS and ORTAVANT, 1970;ASSIS NETO, CARVALHO, MELO et al, 2003a), which had periods of increased growth, coinciding with the phases impuberal, prepuberal, and puberal of sexual development. The acceleration in the testicular growth curve observed after puberty in guinea pigs was not so different from that of the common agouti (ASSIS NETO, MELO, CARVALHO et al, 2003b).…”

“…Highly significant correlation (p < 0.01) between body mass, age and other testicular parameters agreed with Murrah buffalo bulls (LUZ, SANTOS, ANDRIGHETTO et al, 2013) and contrasted to the correlation described only between the testis mass and the length, width and tubule diameter in collared peccary (GUIMARÃES, CARDOSO, FERREIRA et al, 2013) and between testicular mass and length and between testicular mass and width (FRANÇA, SILVA-JUNIOR, CHIARINI-GARCIA et al, 2000;FERREIRA, GUIMARÃES, LUZ-RAMOS et al, 2004;SONNER, MIGLINO, SANTOS et al, 2004;OHASHI, MIRANDA, CORDEIRO et al, 2007). Thus, highly significant correlation (p < 0.01) between age, body mass and testicular biometric data indicated that, in guinea pigs, testicular development depended both on age and body development, as in other rodent species (ASSIS NETO, CARVALHO, MELO et al, 2003a;FERREIRA, GUIMARÃES, LUZ-RAMOS et al, 2004), in opposition to other mammal species, in which testicular development rather depends on body development (COUROT, HOCHEREAUA-DE REVIERS and ORTAVANT, 1970) or those with gradual loss in the correlations between testicular measurements and body mass in the adult phase (SOUZA, ARAÚJO, OLIVEIRA et al, 2010). GSI in guinea pigs was within the range regarded as normal for rodents, 0.10% to 8.00% (KENAGY and TROMBULAK, 1986), and the value observed in the phase postpuberal 2 (0.44%) was inferior to that observed in Swiss mice, 0.69% (MORAIS, BARBOSA, NEVES et al, 2009), and chinchillas, 0.80% (LEAL and FRANÇA, 2008), and superior to those observed in pacas, 0.22%, agoutis, 0.33% (COSTA, LEAL, FERREIRA et al, 2013), and capybaras (0.14% in MOREIRA, CLARKE and MACDONALD, 1997;0.12% in PAULA, COSTA and MATTA, 2002).…”

Development of spermatogenesis in captive-bred Spix's yellow-toothed cavy (Galea spixii)

“…These studies have included investigations of cattle Curtis and Amann 1981), pigs (Orsi et al 1985;França 1987), buffalo (Melo and Vale Filho 1992) and goats . However, similar studies on Brazilian wildlife are scarce and have primarily been performed on the collared peccary, white-lipped peccary, agouti paca and capybara (Assis- Neto et al 2003a;Costa et al 2004. Methods for histological quantification of the efficiency of spermatogenesis can accurately determine spermatozoa production in individuals of the same species or among species (Vale Filho 2001).…”

Reproduction in agouti (Dasyprocta spp.): A review of reproductive physiology for developing assisted reproductive techniques

“…Regarding reproductive development in males, Costa et al (2010) observed that the spermatogenic cycle lasts for 9.5 ± 0.03 days, and the total duration of spermatogenesis is 42.8 ± 0.16 days. According to Assis Neto et al (2003a), the period from birth to five months comprises the pre-pubertal period, in which the presence of gonocytes is observed with the absence of tubular lumen in the testicular cords as well as the presence of spermatogonia, spermatocytes, spermatids, Sertoli and Leydig cells (Arroyo et al, 2017); from six to eight months of age is the transition phase (pre-puberty to puberty), in which 40% to 90% of the testicular cords are in the process of tubular lumination, coinciding with the appearance of the first primary spermatocytes and rounded spermatids. Puberty in male agouti is established at around the age of nine months, where it is possible to observe the presence of all cell types and spermatozoa in the testicular lumen after eight stages of the cycle of the seminiferous epithelium (Assis Neto et al, 2003b).…”