Breeding seasons and notes on some other aspects of reproduction in captive camelids

Schmidt, Christian R.

doi:10.1111/j.1748-1090.1973.tb02187.x

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…No corpus luteum was detected in neither sample. Ovulation in SAC is induced in response to mating, and in the absence of mating or ovulation‐inducing, mature follicles start to regress (Schmidt, 1973). The absence of males in this group of females suggests that remnant structures correspond to atretic follicles and not to corpus albicans, the regressed form corpus luteum.…”

Section: Resultsmentioning

confidence: 99%

“…No corpus luteum was detected in neither sample. Ovulation in SAC is induced in response to mating, and in the absence of mating or ovulation-inducing, mature follicles start to regress (Schmidt, 1973).…”

Section: Re Sults and Discussionmentioning

confidence: 99%

“…Guanaco ( Lama guanicoe ) belongs to the family Camelidae and is the most abundant wild ungulate in Patagonia, South America (Gonzalez et al, 2006). The reproductive strategy of female guanaco includes seasonal breeding in long‐day months (Riveros et al, 2009; Schmidt, 1973), along with repeated cycles of follicular growth and regression, without ovulatory stimulus or mating (Riveros et al, 2010). Dominant follicles development is equally distributed between the left and right ovary, although gestations are in the left uterus horn (Riveros et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Histomorphological changes between short and long days in ovary guanacos (Lama guanicoe)

Moreno

2022

Anat Histol Embryol

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This is the first morpho-histological comparison of guanaco ovaries between reproductive (long-days) and non-reproductive (short-days) seasons, and oestrogen receptor-alpha (ERα) and beta (ERβ) detection. Different stages of follicle development were found in the cortical area, but no corpus luteum was detected. The size and frequency of antral follicles and large atretic follicles were higher in long-day ovaries than short-days, consistent with ovarian activity in this season. Differential expression of ERα and ERβ was observed in follicles at different stages of development between short and long days. These data reveal histological and molecular differences between reproductive and non-reproductive seasons of guanaco ovaries.

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Section: Resultsmentioning

confidence: 99%

Section: Re Sults and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Histomorphological changes between short and long days in ovary guanacos (Lama guanicoe)

Moreno

2022

Anat Histol Embryol

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“…These are the warmest months of the year, with sufficient rain and abundant green forage. 17 In North America, where llamas are kept under good nutritional conditions year-round and copulation is allowed only on an individual basis, they are considered nonseasonal breeders. This marked seasonality of reproduction also is characteristic of the wild species-the vicuña and guanaco.…”

Section: Seasonalitymentioning

confidence: 99%

Reproductive Anatomy and Life Cycle of the Male and Female Llama and Alpaca

Sumar¹,

Adams²

2007

Current Therapy in Large Animal Theriogenology

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“…The population status varies widely, while some have recovered, others are critically endangered and close to extinction (González et al., 2006). This species exhibits seasonal reproduction (Riveros et al., 2009), and the mating season takes place during the long photoperiod (Garay et al., 1995; Schmidt, 1973) that coincides with the best environmental conditions. Female guanacos have mating‐induced ovulation and a gestation period lasting 11.5 months (Riveros et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

The effect of photoperiod and melatonin on plasma prolactin concentrations in female guanaco (Lama guanicoe) in captivity

Correa

Moreno

Riveros

2020

Reprod Domestic Animals

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The present study examined the effects of different photoperiods and melatonin treatment on plasma prolactin concentrations in guanacos, a South American camelid, in captivity. Fourteen adult female guanacos, not gestating or lactating and isolated from males, were studied. The control group was exposed to natural daylight, during short days (N = 7, 10L:14D) and long days (N = 7, 16L:8D). The treatment group (N = 7, 10L:14D) received melatonin implants every 23 days for 6 weeks during long days. Blood samples were taken at intervals of 1 week for 3 weeks, starting the third week of treatment. Prolactin concentrations were measured using competitive ELISA. Plasma concentrations of prolactin in non‐lactating female guanacos have seasonal changes, with a higher concentration (p < .001) in short days (3.50 ± 2.24 ng/ml) than long days (1.10 ± 0.91 ng/ml). Melatonin treatment significantly decreases (p < .05) plasma concentrations of prolactin on the 21st day after the treatment. These findings are the first report of an endogenous circannual rhythm of plasma prolactin concentration and the action of melatonin treatment on prolactin secretion in this wild camelid.

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Breeding seasons and notes on some other aspects of reproduction in captive camelids

Cited by 15 publications

References 4 publications

Histomorphological changes between short and long days in ovary guanacos (Lama guanicoe)

Histomorphological changes between short and long days in ovary guanacos (Lama guanicoe)

Reproductive Anatomy and Life Cycle of the Male and Female Llama and Alpaca

The effect of photoperiod and melatonin on plasma prolactin concentrations in female guanaco (Lama guanicoe) in captivity

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