Factors Influencing Sexual Maturation, Puberty and Reproductive Efficiency in the Gilt

Dyck, G. W.

doi:10.4141/cjas88-001

Cited by 28 publications

(17 citation statements)

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“…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%

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: Discussionmentioning

confidence: 99%

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

et al. 2003

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“…In physiological terms, the moment of reaching sexual maturity (puberty) is defined by the appearance of the first ovulation and the establishment of the first estrous cycle in normal duration (18-24 days), or a gilts' ability to establish and maintain a normal pregnancy, after insemination (Dyck, 1988). However, a large number of gilts, culled from breeding because of long-term prepuberty anoestrus, had established a normal cyclical ovarian activity, as shown by the results of morphological examination of their ovaries post-mortem (Stančić et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ovulation Rate in Gilts Treated with Different Hormone Protocols

Stančić

Bošnjak

Apić

et al. 2017

AGR

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In this study different hormonal protocols were used, in order to determine their effectiveness in ovulation value rated postmortem by the inspection of the ovaries of treated gilts. The total of 48 prepubertal Swedish Landrace gilts were used in the study, aged 150 to 160 days, 30 sexually mature gilts, aged 180 to 210 days, with a pre-established one spontaneous estrus (first pubertal), 30 gilts aged 210 to 240 days, with a determined two spontaneous (first and second pubertal) estrus, and 40 long-term anestric gilts, aged 280 to 290 days. The following hormone protocols were conducted: 400 I.U. eCGone-time; 750 I.U. ECG -one time; 1000 IU eCG-one-time; 1500 IU eCGone-time; 250 ηg PGF2α-one time; 20 mg Altrenogest and the combination of 20 mg Altrenogest and 1,000 I.U. eCG at the end of treatment with altrenogest. An overview of the reproductive organs of slaughtered gilts was carried out in the Laboratory for Reproduction of Domestic Animals at the Faculty of Agriculture, Novi Sad. It was found that the ovulation value of the treated gilts depends primarily on the dose of ECG and reproductive status of gilts at the moment of initiation of hormone treatment.

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“…Bolet et al 1977). The standard deviation in age at puberty within a herd is approximately 20 d (Dyck 1988a). Restriction of diet intake to less than 70% of free choice feeding during the growing phase results in a delay in the onset of puberty (Etienne et al 1983;King 1989). Gilts housed in confinement are older at puberty than gilts housed in outside lots (Christenson 1986).…”

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confidence: 99%

“…, Huhges and Varley (1980), Hughes (1982), Christenson (1986) and Dyck (1988a)). Based on these reviews, and other research, several aspects ofpuberty in the gilt have been established.…”

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confidence: 99%

“…Thus, effective controlled stimulation of puberty (to minimize the time required to breed a group of gilts) is possible only when the majority of gilts are sexually mature (Burnett et al 1988;Dyck 1988a). Once a producer has established an effective age at which to move gilts and expose them to a mature boar, the type of housing facility and management become critical factors affecting the efficiency of puberty stimulation (Dyck 1988a For personal use only. (d) ievel of diet intake.…”

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Influence of Breed of Sire, Dietary Intake and Housing Facilities on the Attainment of Puberty in Crossbred Gilts

Dyck¹

1989

Can. J. Anim. Sci.

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Dycx, G. W. 1989. lnfluence of breed of sire, dietary intake and housing facilities on the attainment of puberty in crossbred gilts. Can. J. Anim. Diet intake restriction and group penning had similar effects on the mean interval to puberty, with C and R gilts averaging 13.6+1.0 and 11 .4+1.0 d (P<0.01), and S and G gilts averaging 12.3+0.9 and 18.7-F 1.1 d (P<0.01). Both the R and G treatments resulted in a delay in the attainment of puberty as compared to S-penned C gilts. This difference was apparent within 3 d. The delay in puberty associated with diet intake restriction was found only in S-penned gilts and was eliminated l0 d after the R gilts were placed on the C level of diet intake. The group penning delay in attaining puberty was evident for 31 d in Y-sired gilts and to the end of the experiment in L-sired gilts.In L-sired gilts 85.3 and 55.6% of the S and G gilts, respectively, attained puberty (P<0.05) as compared to74.6 and76.9% of the Y-sired gilts. Thus, the ability of the gilt to attain pubeny in response to boar exposure is dependent on the breed of gilt, diet intake and pen type, with stails and an adequate growth rate required for the greatest response.

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Factors Influencing Sexual Maturation, Puberty and Reproductive Efficiency in the Gilt

Cited by 28 publications

References 10 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

Ovulation Rate in Gilts Treated with Different Hormone Protocols

Influence of Breed of Sire, Dietary Intake and Housing Facilities on the Attainment of Puberty in Crossbred Gilts

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