کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2457832 | 1110733 | 2009 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The effect of the spring management system on blood metabolites and luteal function of ewes on Mediterranean mountain areas The effect of the spring management system on blood metabolites and luteal function of ewes on Mediterranean mountain areas](/preview/png/2457832.png)
Forty-eight adult ewes rearing single lambs were assigned to four management systems with the aim of comparing their productive, metabolic and luteal function response within the anoestrus season: (1) Indoor ewes (IND): Ewes and lambs permanently indoors. Dams fed a total dry mixed ration (forage to concentrate ratio 40:60). (2) Indoor plus rationed grazing ewes (IND-GR): Ewes stocked 8 h daily outdoors and receiving a supplement of barley meal indoors. Lambs from IND and IND-GR were weaned at 6 weeks old and fed concentrates ad libitum whereas their dams were stocked continuously on grassland until late spring. (3) Grazing plus supplement for lambs (GR + S): Ewes and lambs continuously stocked on grassland. Lambs received concentrate ad libitum and suckled their mothers until slaughter. (4) Grazing (GR): The same management as GR + S, but lambs did not receive any concentrate.The average daily gain of ewes throughout the rearing period was higher in IND, GR + S and GR than in IND-GR (P < 0.05). By contrast, on the whole 3 months post-partum ewes managed in confinement during lactation (IND) showed a slight daily loss of live-weight while the rest of the groups displayed gains (P < 0.05). Energy-corrected milk yield during 6 weeks post-partum was higher in IND and GR + S (P < 0.05). The mean plasma triglycerides during 3 months post-partum was higher in IND and GR (P < 0.05). Plasma NEFA were greater whereas plasma urea was lower in IND and IND-GR on weeks 3 and 5 of lactation (P < 0.05). After weaning of indoor treatments (IND and IND-GR), plasma urea was rebalanced in these groups until values close to continuous stocked treatments (GR + S and GR). The proportion of ewes resuming their first luteal phase within spring (nearly 45%) was similar across treatments (P > 0.05). In conclusion, the divergent post-partum metabolic status of ewes managed under grass-based compared to concentrate-based systems during the spring season did not carry over significant effects on their post-partum luteal function.
Journal: Small Ruminant Research - Volume 82, Issue 1, March 2009, Pages 18–26