Identification of measures predictive of age of puberty onset in gilts
| Autor: | Kenneth J. Stalder, Kody L. Graves, Benjamin J. Hale, Jason W. Ross, Elane C. Wright, Bethany R. Mordhorst, Aileen F. Keating |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
endocrine system puberty gilt development Andrology 03 medical and health sciences Follicle 0302 clinical medicine Follicular phase Medicine Postnatal day reproductive and urinary physiology Estrous cycle 030219 obstetrics & reproductive medicine General Veterinary business.industry Reproduction follicle development Antral follicle female genital diseases and pregnancy complications 030104 developmental biology Herd Estrus Detection Animal Science and Zoology business Puberty onset |
| Zdroj: | Translational Animal Science |
| ISSN: | 2573-2102 |
| Popis: | A potential indicator of female lifetime productivity in swine is age of puberty, when a gilt achieves her first behavioral estrus. Follicular activity, as determined by tertiary follicle development, in prepubertal gilts begins during postnatal day (PND) 75 to 115. The central hypothesis of this study is that gilts demonstrating tertiary follicle development earlier in life, assessed using vulva size as a proxy, achieve puberty earlier in life compared with counterparts of a similar age and weight that lack tertiary follicle development. The objectives of this project were to identify a developmental time point when variation in ovarian development exists and to determine whether a relationship between the age prepubertal ovarian development and the age at onset of puberty exists. To accomplish this, 155 gilts of similar age (± 2 d) were weighed and vulva size measured on PND 75, 85, 95, 105, and 115. Vulva measures, including vulva width (VW), vulva length (VL), and vulva area (VA), were utilized as developmental proxies for follicular activity. At each time point, gilts (n = 10) were sacrificed and ovarian follicular activity recorded. In a subset of gilts (n = 105), estrus detection was conducted daily on PND days 126 to 200. Mean VA on PND 75, 85, 95, 105, and 115 was 596 ± 206, 683 ± 190, 864 ± 212, 1014 ± 228, and 1265 ± 252 mm2, respectively. Of the gilts demonstrating behavioral estrus, 28 were within PND 140 to 160, 36 between PND 161 to 180, 15 between PND 181 to 200, and 26 did not demonstrate estrus behavior within 200 d of age. All gilts euthanized at PND 75 lacked follicular activity as defined by having a minimum of 2 antral follicles per ovary, whereas 60%, 80%, 90%, and 100% demonstrated follicular activity on PND 85, 95, 105, and 115, respectively. Body weight at PND 75 and VW at PND 115 were correlated to age at first estrus (P < 0.05). Of the gilts whose VA was less than 1 SD from the mean on PND 95 (i.e. |
| Databáze: | OpenAIRE |
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