Short-term dietary effects on reproductive wastage after induced ovulation and artificial insemination in primiparous lactating Sarda ewes

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Short-term dietary effects on reproductive wastage after induced ovulation and artificial insemination in primiparous lactating Sarda ewes

Year: 

2000

Source of publication :

Animal Reproduction Science

Authors :

לנדאו, יאן

.

Volume :

Co-Authors: 

Branca, A., Ist. Zootecnico Caseario Per S., 07040 Olmedo, Italy
Molle, G., Ist. Zootecnico Caseario Per S., 07040 Olmedo, Italy
Sitzia, M., Ist. Zootecnico Caseario Per S., 07040 Olmedo, Italy
Decandia, M., Ist. Zootecnico Caseario Per S., 07040 Olmedo, Italy
Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, Bet Dagan 50250, Israel

From page: 

59

To page: 

71

(

Total pages: 

13

)

Link :

Short-term dietary effects on reproductive wastage after induced ovulation and artificial insemination in primiparous lactating Sarda ewes

Abstract: 

Short-term effects of nutrition on conception rate (CR), ovulation rate (OR), ova and embryo losses (OEL) during the first 50 days following insemination and total reproductive wastage after ovulation (TRW), were investigated in primiparous lactating Sarda ewes after oestrous synchronization and trans-cervical artificial insemination (AI). Eighty ewes grazing a green high-quality pasture were offered one of three iso-energetic supplements from day 14 before to day 2 after AI: whole maize grain (M); soyabean meal (S); maize gluten meal (G); or served as controls (C). Supplements G and S were iso-nitrogenous but provided different amounts of rumen undegradable digestible protein. The intake of herbage and digestible dry matter, measured by the n-alkane method, did not differ among groups, whereas crude protein intake before AI was greater in S and G than in M and C. Average OR was 2.0 per ewe. The frequency of double ovulations was greater in S than in the other groups. Only G-feeding was associated with some cases of OR > 4. Ewes from the S group tended to show a higher CR (73%) than unsupplemented counterparts (45%), the other groups being intermediate (61% and 50% for M and G, respectively). Lower OEL during the first 50 days after AI was found in S ewes than in G, M and C being intermediate (0.52, 1.39, 1.11 and 1.10 per ewe, respectively). Milk urea content > 560 mg/l was associated with lower CR. Ranking by ovulation groups of CR was single < double = triple; and of TRW was double < triple < single. In conclusion, OR in primiparous lactating Sarda ewes grazing on a good quality pasture is high, and CR after AI is reduced by ova as well as embryo loss, especially following single ovulations. Short-term supplementation with a soyabean-based concentrate may help alleviate these losses. (C) 2000 Elsevier Science B.V.