The effect of different postweaning altrenogest treatments of primiparous sows on follicular development, pregnancy rates, and litter sizes
This study investigated follicular development during and after postweaning altrenogest treatment of primiparous sows in relation to subsequent reproductive performance. Primiparous sows (n = 259) were randomly assigned at weaning (d 0) to 1 of 4 groups: control (no altrenogest, n = 71), RU4 (20 mg of altrenogest from d –1 to 2, n = 62), RU8 (20 mg of altrenogest from d –1 to 6, n = 65), or RU15 (20 mg of altrenogest from d –1 to 13, n = 61). Average follicular size (measured by ultrasound) increased during altrenogest treatment and resulted in larger follicles at the start of the follicular phase for RU4, RU8, and RU15 compared with controls (5.3 ± 0.9, 5.5 ± 1.3, 5.1 ± 1.2, and 3.4 ± 0.6 mm, respectively; P <0.0001). Farrowing rate was greater in RU15 (95%) than in RU8 (76%; P = 0.04). The RU15 group also had more piglets (2 to 3 more piglets total born and born alive; P <0.05) than the other treatment groups. Follicular development at weaning clearly affected reproductive performance. At weaning, average follicular size: small (
| Main Authors: | , , , , , , |
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| Format: | Article/Letter to editor biblioteca |
| Language: | English |
| Subjects: | different patterns, estrous-cycle, feed-intake, fertility, gilts, lactating sows, ovulation rate, piglet, progestagen treatment, reproductive-performance, |
| Online Access: | https://research.wur.nl/en/publications/the-effect-of-different-postweaning-altrenogest-treatments-of-pri |
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