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Abstract: The antioxidant effects of dried citrus pulp on proteins in lamb meat, when used as a replacement of concentrate in the feed, was studied using meat from 26 male Comisana lambs. The lambs of age 90days had been grouped randomly to receive one of the three dietary treatments: (1) commercial concentrate with 60% barley (Control, n=8), (2) concentrate with 35% barley and 24% citrus pulp (Cp24, n=9), or (3) concentrate with 23% barley and 35% citrus pulp (Cp35, n=9). Slices from the longissimus thoracis et lomborum muscle were packed aerobically and stored for up to 6days at 4°C in the dark. The citrus pulp groups, Cp24 and Cp35, significantly decreased protein radicals and carbonyls, and preserved more thiols within six days of storage compared to the Control group. The citrus pulp groups significantly slowed down the rate of protein oxidation, indicating that dietary citrus pulp reduced oxidative changes in meat proteins. [Copyright &y& Elsevier]

Abstract: This study investigated the effect of replacing cereal concentrates with high levels of dried citrus pulp in the diet on lamb meat oxidative stability. Over 56 days, lambs were fed a barley-based concentrate (Control) or concentrates in which 24% and 35% dried citrus pulp were included to partially replace barley (Citrus 24% and Citrus 35%, respectively). Meat was aged under vacuum for 4 days and subsequently stored aerobically at 4°C. The Control diet increased the redness, yellowness and saturation of meat after blooming (P< 0.01). Regardless of the level of supplementation, dietary dried citrus pulp strongly reduced meat lipid oxidation over 6 days of aerobic storage (P <0.001), while colour parameters did not change noticeably over storage and their variation rate was not affected by the diet. In conclusion, replacing cereals with dried citrus pulp in concentrate-based diets might represent a feasible strategy to naturally improve meat oxidative stability and to promote the exploitation of this by-product. [Copyright &y& Elsevier]

The purpose of this trial was to study the effects of citrus pulp inclusion in ostrich diets on meat quality, evaluated on iliofibularis and gastrocnemius muscles. M. iliofibularis had a lower ultimate pH (P<0.05) and was lighter in colour (P<0.05) than M. gastrocnemius. The latter had higher moisture (P<0.05) and lower crude protein contents (P<0.05) as compared to M. iliofibularis. M. gastrocnemius had a lower proportion of C14:0 (P<0.05), C16:0 (P<0.05) and C16:1 (P<0.05) and a higher percentage of C18:0 (P<0.05), C20:2ω6 (P<0.05), C20:4ω6 (P<0.05) and C20:5ω3 (P<0.05) than M. iliofibularis. Citrus pulp diet increased (P<0.05) meat ultimate pH and reduced cooking losses (P<0.05) as compared to the control diet. Meat from animals given citrus pulp had lower crude fat (P<0.05) and ash percentages (P<0.05) in comparison to that from the control group. The proportions of intramuscular saturated and monounsaturated fatty acids were lower (P<0.05) in the citrus pulp group as compared to the control one. Meat from the citrus pulp treatment group had a higher (P<0.05) percentage of polyunsaturated fatty acids than meat from the control treatment. In particular, meat from ostriches given citrus pulp diet exhibited higher C18:2ω6 (P<0.05) and C20:4ω6 (P<0.05) contents that accounted for a higher ω6/ω3 ratio (P<0.05) as compared to the control group. Overall, the use of a citrus pulp-included diet in ostrich feeding did not adversely affect meat quality and, therefore, citrus pulp seems to be a possible ingredient to reduce feeding costs. [Copyright &y& Elsevier]

The current study compared the growth performance, carcass and meat quality effects of feeding 150 g/kg DM of dried citrus pulp (DCP) or grape pomace (DGP) as alternative dietary fibre sources to 7 months-old Angus steers for 90d. Twenty-four steers were assigned to three dietary treatments (8 steers/treatment) in completely randomised design. Each steer was treated as an experimental unit. Feeding the DGP and DCP diets resulted in greater (P ≤ 0.05) average daily gain and live weight compared to the control diet. Steers fed the DGP diet had higher (P ≤ 0.05) dry matter intake, warm and cold carcass weights than those fed the DCP and control diets. Shear force and income over feed costs were greatest for the DGP diet followed by the DCP and control diets (P ≤ 0.05). Current findings suggest DGP is a better fibre source than DCP resulting in enhanced growth performance, carcass attributes and economic viability of feedlot steers. • Productivity of steers fed dried citrus pulp (DCP) or grape pomace (DGP) were compared. • DMI and carcass weights were greater for DGP diet compared to DCP and control diets. • Steers fed DGP and DCP had greater ADG and live weight compared to the control diet. • Shear force and income over feed costs were greatest for the DGP diet. [ABSTRACT FROM AUTHOR]