The influence of insulin administration after weaning the first litter on ovulation rate and embryo survival in sows
| Autor: | N.C Whitley, H Zhang, N M Cox, D.B Payne |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Ovulation
Litter (animal) medicine.medical_specialty Time Factors Swine media_common.quotation_subject medicine.medical_treatment Gestational Age Weaning Biology Animal science Estrus Food Animals Pregnancy Internal medicine Lactation medicine Animals Insulin Small Animals Fetal Death media_common Estrous cycle Equine Uterus Gestational age Organ Size Parity Endocrinology medicine.anatomical_structure Gestation Female Animal Science and Zoology |
| Zdroj: | Theriogenology. 50:479-485 |
| ISSN: | 0093-691X |
| DOI: | 10.1016/s0093-691x(98)00154-x |
| Popis: | Primiparous crossbred sows (n = 43), lactating for an average of 21.1 +/- 0.1 d and weaning 8.7 +/- 0.1 pigs, were used to evaluate the influence of insulin on ovulation rate and embryo survival. The sows were maintained on 2.3 kg/head/d of a 14% protein gestation diet during pregnancy, fed ad libitum during lactation, given 2.7 kg/head/d from weaning until re-breeding and fed 2.3 kg/head/d after mating. Beginning the day after weaning (Day 0) sows were treated with 0.4 IU/kg body weight (BW) insulin (n = 21) or were administered an equivalent volume of saline (n = 22) for 4 d. Beginning on Day 3 and continuing until Day 14 after weaning, the sows were checked for estrus twice daily and were artificially inseminated using pooled semen from 2 fertile boars. At slaughter (days 30 to 40 of gestation), ovaries and uteri were collected, and the ovulation rate, embryo number and viability, and uterine weight and length were evaluated and recorded. Use of insulin decreased the average interval from weaning to estrus compared with saline by increasing percentage in estrus by Day 14 after weaning (5.0 +/- 0.57 vs 6.9 +/- 0.56 d, respectively; P < 0.03). Ovulation rate, number of embryos, embryo survival, and average uterine length and weight were not influenced by insulin treatment. Overall, insulin affected reproductive efficiency in primiparous sows by increasing the percentage of sows in estrus. |
| Databáze: | OpenAIRE |
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