Endocrine changes and management factors affecting puberty in gilts

Evans, A.C.O.; O’Doherty, John V.

doi:10.1016/s0301-6226(00)00202-5

Cited by 58 publications

(50 citation statements)

References 99 publications

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“…The mean "uterine area" increased during this period. These observations were in agreement with the fact that a number of social or environmental changes (transport, relocation and boar exposure) can precipitate the onset of puberty and in most of the gilts an oestrus was observed within the week after the transport stress (experiment 3: 79% of the gilts were in oestrus within 7 days), [7,10].…”

Section: Discussionsupporting

confidence: 86%

“…The onset of puberty induced a marked increase in uterine horn weight and length. Probably as a result of stimulation by increased plasma oestrogen levels that occur just prior to oestrus [7].…”

Section: Discussionmentioning

confidence: 99%

“…From batch to batch, the onset of puberty is variable and is generally spread over several weeks [6,7,28,29]. For the breeders, such variability in the age of puberty is a problem for the introduction of the gilts in batches of farrowings.…”

Section: Discussionmentioning

confidence: 99%

“…In a group of gilts, the spontaneous occurrence of the first oestrus is generally spread over several weeks; within the Large White breed, a range around 15 weeks has been recorded between the earliest and the oldest age [6]. Environmental and management conditions influence the timing of puberty [7]. The presence of the boar accelerates the occurrence of puberty [8] and when associated with transport stress, allows synchronisation of an increased proportion of first oestrus within a few days.…”

Section: Introductionmentioning

confidence: 99%

“…This period has been characterised by a decrease in LH and FSH secretions and an increase in ovarian secretions [11] which act on uterine development and the central nervous system [2,7,12,13]. The growth of the uterus has been observed during this period [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Determination by echography of uterine changes around puberty in gilts and evaluationof a diagnosis of puberty

et al. 2003

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-Three experiments were carried out to evaluate the use of ultrasonography in assessing the onset of puberty in gilts. In experiment 1, gilts (n = 17) were scanned 3 times per week beginning at 133 and continuing until 187 days of age. The ultrasonic appearance of the uterus was described, quantified and compared with the reproductive status observed at slaughter. The quantification of the pictures showed a different correlation in time for infantile, impubertal, prepubertal and pubertal stages. For pubertal females, "uterine area" increased at around 180 days of age, well-defined sections of the uterine horns appeared 3 ± 0.5 days before puberty. In infantile and impubertal gilts during the same period of age, uterine images remained dark and homogeneous; no significant change in the "uterine area" was observed. This difference in images allowed an evaluation of the diagnosis of puberty. In experiment 2, the gilts (n = 123) were scanned, the result was verified at slaughter the day after by examination of the genital tract. The uterine weight of the gilts that had reached a prepubertal or pubertal stage was significantly greater (P = 0.0001) than that in impubertal gilts. The sensitivity and the specificity of the diagnosis were 91.9% and 96.5% respectively. Experiment 3 was performed on a farm and echographic examinations were carried out one and five days after gilts (n = 117) arrived at the piggery. Oestrus detection or blood sampling for progesterone determinations were used as tools to determine the reproductive status. The sensitivity and the specificity of the diagnosis were 98.9% and 100% respectively. This diagnosis of puberty is thus accurate.pig / puberty / detection / ultrasonography * Corresponding author: fbotte@tours.inra.fr Reprod. Nutr. Dev. 43 (2003) 225-236 225

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination by echography of uterine changes around puberty in gilts and evaluationof a diagnosis of puberty

et al. 2003

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Granulosa cell proliferation in the gilt ovary associated with ovarian status and porcine reproductive and respiratory syndrome virus detection

2015

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Influence of growth rate and onset of boar contact on puberty attainment of replacement gilts raised in Thailand

Roongsitthichai

Olanratmanee

Tummaruk

2014

Trop Anim Health Prod

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This study aimed to investigate the influence of growth rate and onset of boar contact on age at first observed estrus of the replacement gilts raised in Thailand. In total, 766 gilts were measured for body weight and backfat thickness prior to insemination. Body weight was further calculated for growth rate. Estrus detection was performed twice a day by back pressure test with an existence of mature boars with high libido. The first date of boar exposure and that of first observed estrus were individually recorded. Due to growth rate, they were classified into three groups: high (>700 g/day), moderate (600-700 g/day), and low (<600 g/day). According to onset of boar contact, the gilts were grouped into two categories: early (<150 days) and late (≥150 days). The results revealed that the gilts expressed first observed estrus, averagely, at age 205.1 ± 34.1 days, had a growth rate of 615.5 ± 57.6 g/day, and first contact with boars at 160.7 ± 19.9 days of age. The gilts with low growth rate expressed first estrus later than those with moderate (208.6 ± 2.0 vs 198.0 ± 3.2 days, P = 0.033) and high growth rate (208.6 ± 2.0 vs 193.9 ± 6.7 days, P = 0.005) groups. Together with the influence of boar exposure, the gilts contacted boar earlier with high growth rate showed first estrus at age 180.3 ± 10.1 days, whereas those with later boar contact with low growth rate showed first estrus at age 197.9 ± 3.2 days. In summary, the replacement gilts should have high growth rate and contact boar early to attain puberty faster and possess decent subsequent reproductive performance.

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Endocrine changes and management factors affecting puberty in gilts

Cited by 58 publications

References 99 publications

Determination by echography of uterine changes around puberty in gilts and evaluationof a diagnosis of puberty

Determination by echography of uterine changes around puberty in gilts and evaluationof a diagnosis of puberty

Granulosa cell proliferation in the gilt ovary associated with ovarian status and porcine reproductive and respiratory syndrome virus detection

Influence of growth rate and onset of boar contact on puberty attainment of replacement gilts raised in Thailand

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