Effect of feeding system on growth and carcass characteristics of improved Jezersko-Solčava lambs

Cividini, Angela (author), Komprej, Andreja (author), Kermauner, Ajda (author), Kompan, Drago (author)

The objective of this study was to evaluate the effect of feeding system on growth and carcass characteristics of Improved Jezersko-Solčava (JSR) weaned lambs. Thirty-five lambs (25.48 kg) housed in group pens were divided into four groups and offered different diets which consisted of hay and second harvest in the ratio of 40:60 and a supplement of 650 g concentrate (Diet 1), hay and second harvest in the ratio of 40:60 (Diet 2), hay and 650 g of concentrate (Diet 3), and just hay (Diet 4) for 50 days. Daily intake was calculated by weighting the offered amount and leftovers of concentrate and forage. Daily intake per lamb contained 15.56 MJ, 14.38 MJ, 16.57 MJ, and 12.23 MJ ME for the Diet 1, 2, 3, and 4, respectively. Lambs were slaughtered at 30.77 kg of live weight. Lambs fed Diet 1 reached the highest DG (165.5 g/day), followed by Diet 3 (146.89 g/day), Diet 2 (123.55 g/day) and Diet 4 (75.51 g/day). HCW and CCW were higher in Diet 1 and 3, compared to Diet 2 and 4. Lambs fed Diet 3 had the highest DP (45.35%), followed by Diet 1, 2, and 4 with 44.33, 41.10 and 39.51%, respectively. The lowest kidney-pelvic fat was observed in lambs fed Diet 4 (5.64) and the highest in Diet 3 (7.66). These results demonstrate that fattening of weaned JSR lambs fed by forage-concentrate diets produced heavier carcasses than those only fed by forage, without significant effects on carcass fatness or carcass conformation.

• Language: English
• Keywords: sheep, breeds, Improved Jezersko-Solčava sheep, growth, carcass characteristics, feeding system, animal nutrition, diet
• Work type: Not categorized
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Year: 2012
• Number of pages: Str. 59-65
• Numbering: Letn. 100, št. 1
• PID: 20.500.12556/RUL-17712
• UDC: 636.5.084/.087
• ISSN on article: 1581-9175
• COBISS.SI-ID: 3083144
• Publication date in RUL: 11.07.2014

Record is a part of a journal

• Title: Acta agriculturae Slovenica
• Shortened title: Acta agric. Slov.
• Publisher: Biotehniška fakulteta
• ISSN: 1581-9175
• COBISS.SI-ID: 213840640

Secondary language

• Language: Slovenian

Abstract

Ugotavljali smo vpliv različnega krmljenja na rast in klavne lastnosti odstavljenih jagnjet oplemenjene jezerskosolčavske pasme (JSR). Petintrideset jagnjet (25,48 kg) je bilo uhlevljenih v 4 skupine po 8-9 jagnjet in krmljenih z različnimi krmnimi obroki v intervalu 50 dni. Skupina 1 je dobivala seno in otavo (40:60) ter 650 g koncentrata, skupina 2 seno in otavo (40:60), skupina 3 seno in 650 g koncentrata ter skupina 4 samo seno. Dnevno zauživanje krme smo izračunali na podlagi dnevnih tehtanj koncentrata in voluminozne krme ter njihovih ostankov. Jagnjeta so dnevno zaužila v povprečju 15,56 MJ, 14,38 MJ, 16,57 MJ in 12,23 MJ ME v skupini 1, 2, 3 in 4. Jagnjeta smo zaklali pri povprečni telesni masi 30,77 kg. Jagnjeta iz skupine 1 so dosegla največji dnevni prirast (165,5 g/dan), sledila je skupina 3 (146,89 g/dan), nato skupina 2 (123,55 g/ dan) in skupina 4 (75,51 g/dan). Masa toplihin hladnih trupov je bila večja pri jagnjetih iz skupin 1 in 2 v primerjavi s skupinama 2 in 4. Jagnjeta iz skupine 3 so dosegla najboljšo klavnost (45,35 %), sledila so jagnjeta iz skupin 1, 2 in 4 (44,33, 41,10 in 39,51 %). Notranja zamaščenost je bila najnižje ocenjena pri trupih jagnjet iz skupine 4 (5,64), najvišje pa pri trupih jagnjet iz skupine 3 (7,66). Zaključimo lahko, da je pitanje odstavljenih JSR jagnjet z obroki na osnovi voluminozne krme in dokrmljevanjem s koncentratom prispevalo k hitrejši rasti in kot rezultat dajalo težje trupe, pri čemer se zamaščenost in mesnatost klavnih trupov ni statistično značilno spremenila.

• Keywords: ovce, pasme, krmljenje, prehrana, rast