Uniparidade em pacas criadas em cativeiro (Agouti paca, Linnaeus, 1766)

Abstract

Durante quatro anos foram detectadas 25 prenhezes, em 13 diferentes pacas, por meio de ultra-sonografia. Após a detecção ultra-sonográfica, as fêmeas foram separadas em baias individuais para o nascimento dos filhotes e aí mantidas até o desmame. Houve nascimento de apenas um animal por parto, ressaltando a característica reprodutiva de uniparidade, o que sugere a tendência de nascimento de apenas um filhote por parto, nessa espécie.

Synchronization of estrus in paca (Cuniculus paca L.): possible impacts on reproductive and productive parameters

“…It means an increase of 50% on expected births. These results differ from those reported by Nogueira et al (2006), Oliveira et al (2007), and Bonilla-Morales et al (2013), who underscore uniparous reproductive trend of giving one offspring per birth. Therefore, investigating whether there is an association between the applied treatment and multiple births in paca remains as an impending need.…”

“…This fact can be explained by the occurrence of twin births in treated females, giving birth to paca babies with lower weights. Nonetheless, such results were similar to those observed by Guimarães et al (2008) regarding the average birth weight for females and males: 605.9 ± 736.7 ± 108.4 and 87.5 g, Ribeiro and Zamora (2008), and Oliveira et al (2007) at 787 ± 51.23 g and 741.14 grams, respectively; and superior to Hosken (1999), 500 to 650 g, and Santos et al (2005), 615 and 617 g for males and females, respectively.…”

Age at sexual maturity, first parturition and reproductive senescence in wild lowland pacas (Cuniculus paca): Implications for harvest sustainability

“…Hence, even when there is consideration of the findings in the present study that pacas sexually mature earlier than what was previously reported, pacas still reproduce less efficiently than expected when calculations were based on data from previous studies. In addition, pacas produce one offspring per gestation and in Amazonia there is an unexpected seasonal pattern of reproduction that converges with periods when there is greater hunting intensity and consequently the harvesting of a large number of pregnant females for human consumption (Oliveira et al, 2007;Mayor et al, 2013Mayor et al, , 2017Valsecchi et al, 2014;El Bizri et al, 2018). When results of the present and previous studies are considered, there needs to be a critical review of previous population sustainability assessments for the species, and calculations of sustainable yields for future in situ management actions (ie., establishment of hunting quotas) should be more conservative.…”

“…The paca is a polyestrous species with spontaneous ovulation and an estrous cycle of 32.5 ( ± 3.69) days that breeds throughout the year in captivity (Guimarães et al, 2008). Additionally, the paca is a uniparous species with rare cases of twin gestations (Pérez and Hernández, 1979;Merrit, 1989;Oliveira et al, 2003Oliveira et al, , 2007. In the Amazon, the lowland paca in its natural habitat has 1.37-1.48 annual parturitions that are seasonally distributed depending on the amounts of fruitification and river water, with a long estimated farrowing interval of 247-266 days (Mayor et al, 2013;El Bizri et al, 2018).…”

Reproductive Technologies Used in Female Neo-Tropical Hystricomorphic Rodents

“…The paca ( C. paca ) is a medium-sized rodent, weighing on average 7.7 kg [ 36 ]. In captivity, females were found to be polyestrous animals that bred year-round with puberty being attained at 8–12 months and having an estrous cycle of 32.5 ± 3.7 days and a gestation length of 148.6 ± 4.8 days [ 37 ], culminating in the production of one offspring [ 38 ]. Newborn pacas weighed 691–902 g [ 39 ].…”