Early Embryo Survival and Development in Sows with Lactational Ovulation
| Autor: | P. Langendijk, Bas Kemp, M.A.M. Taverne, Nicoline M. Soede, R. Gerritsen |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Time Factors
Litter Size Pregnancy Rate Swine Placenta animal diseases Random Allocation Endocrinology Lactation primiparous sows media_common food and beverages pigs Embryo Animals Suckling medicine.anatomical_structure nutrition Adaptation Physiology Female pregnancy Luteinizing hormone Biotechnology Ovulation profiles medicine.medical_specialty prolactin media_common.quotation_subject Embryonic Development luteinizing-hormone Weaning Biology progesterone Animal science Estrus reproductive-performance medicine Animals Adaptatiefysiologie Estrous cycle Gynecology Pregnancy Uterus Embryogenesis medicine.disease Prolactin WIAS Pregnancy Animal Animal Science and Zoology estradiol-17-beta |
| Zdroj: | Reproduction in Domestic Animals 43 (2008) 1 Reproduction in Domestic Animals, 43(1), 59-65 |
| ISSN: | 0936-6768 |
| Popis: | During lactation, daily separation of sow and piglets, intermittent suckling (IS), can induce lactational oestrus and ovulation. This study examined effects of IS on subsequent early embryo survival and development. Multiparous Topigs40 sows were separated from their piglets for either 12 consecutive hours per day (IS12, n ¼ 13) or two times for 6 h per day (IS6, n ¼ 10) from day 14 of lactation onwards until 23 days after ovulation. Control sows (C, n ¼ 17) were weaned at day 21 of lactation. Oestrus was shown in all treatments within 5 days after the start of treatment. Sows were inseminated each day of oestrus and slaughtered at D23 after ovulation. Intermittent suckling did not significantly affect pregnancy rates of sows (75% IS12 vs 78% IS6 vs 94% C; p > 0.10). Embryo survival was not significantly affected by IS (IS12: 57%; IS6: 51%; p > 0.10) although it seemed to be lower than in C sows (70%). Some parameters of embryo, placental and uterine development were affected by IS, especially in the IS6 group. IS6 embryos had shorter placentas (17.5 ± 1.2 cm; p < 0.05) than C (20.3 ± 1.4 cm) and IS12 sows (20.9 ± 0.7 cm) were smaller and less developed than C sows (p < 0.05). In conclusion, embryo survival does not seem significantly affected by IS, although numerical differences were great. Embryo development, however, was negatively affected in IS6 sows possibly due to a combination of high milk production, stress and lactational effects on uterine development. |
| Databáze: | OpenAIRE |
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