Sugarcane silage treated with calcium hydroxide in feedlot cattle diet: animal performance and meat quality / Desempenho e qualidade da carne de novilhos confinados alimentados com silagem de cana-de-açúcar tratada com hidróxido de cálcio

Este estudo teve como objetivo avaliar silagem de cana-de-açúcar (Saccharum officinarum L) tratada com hidróxido de cálcio - Ca(OH)2 - (cal hidratada) como único volumoso em ração para confinamento de gado de corte, com respeito ao desempenho e qualidade da carne dos animais. Quarenta e cinco novilhos Canchim (22 meses de idade, 345 kg de peso vivo- PV) foram distribuídos, em um delineamento em blocos casualizados, em três tratamentos (rações totais - RTs - com 35% de volumoso): T1 - RT com cana-de-açúcar fresca; T2 - RT com silagem de cana-de-açúcar tratada com hidróxido de cálcio (10 g Ca(OH)2/kg de forragem fresca); T3 - RT com silagem de milho. Foram avaliados o consumo de matéria seca (CMS), consumo de MS digestível (CMSD), consumo de proteína bruta (CPB), eficiência alimentar (EA), ganho médio diário (GMD) e rendimento de carcaça (RC). A carne foi avaliada quanto a parâmetros de qualidade (pH, capacidade de retenção de água, perdas no cozimento, cor e força de cisalhamento) e de análise sensorial descritiva. Os novilhos alimentados com a silagem de cana-de-açúcar tratada com hidróxido de cálcio apresentaram similares (P>0.05) CMS (10,8 kg/d), CMSD (8,5 kg/d) e RC (52,6%); mais alto (P0.05) (1,5 kg PV/d e 0,15 kg PV/kg CMS, respectivamente). As diferentes rações não afetaram (P>0.05) os parâmetros de qualidade e os atributos sensoriais da carne, com exceção da cor da gordura e sabor estranho na carne. Concluiu-se que o hidróxido de cálcio pode ser indicado como um eficiente aditivo para...

This study aimed to evaluate sugarcane (Saccharum officinarum L) silage treated with calcium hydroxide - Ca(OH)2 - (slacked lime) as the only roughage source in a feedlot ration, regarding animal performance and meat quality. Forty five Canchim steers (22 months old, 345 kg body weight - BW) were assigned, in a complete randomized block design, to three treatments (total mixed rations - TMRs - with 35% roughage): T1- TMR with fresh sugarcane; T2 - TMR with sugarcane silage treated with calcium hydroxide (10 g Ca(OH)2/kg of fresh forage); T3 - TMR with corn silage. Dry matter intake (DMI), digestible DM intake (DDMI), crude protein intake (CPI), feed efficiency (FE), average daily gain (ADG) and dressing percentage (DP) were evaluated. Meat was analyzed for quality parameters (pH, water holding capacity, cooking loss, color and shear force) and sensory attributes. Steers fed the silage treated with calcium hydroxide presented similar (P>0.05) DMI (10.8 kg DM/d), DDMI (8.5 kg/d) and DP (52.6%); higher CPI (1.8 vs. 1.4 kg/d) and lower (P0.05) ADG and FE (1.5 kg BW/d and 0.15 kg BW/kg DMI, respectively). The different rations did not affect (P>0.05) meat quality parameters and sensory attributes, except for fat color and off flavor sensory attribute. It was concluded that calcium hydroxide can be indicated as an efficient additive for sugarcane ensilage. Feedlot cattle fed TMR containing sugarcane silage treated with Ca (OH)2, as the only roughage source, presented adequate performance and meat quality.

Sugarcane silage treated with calcium hydroxide in feedlot cattle diet: animal performance and meat quality / Desempenho e qualidade da carne de novilhos confinados alimentados com silagem de cana-de-açúcar tratada com hidróxido de cálcio

Este estudo teve como objetivo avaliar silagem de cana-de-açúcar (Saccharum officinarum L) tratada com hidróxido de cálcio - Ca(OH)2 - (cal hidratada) como único volumoso em ração para confinamento de gado de corte, com respeito ao desempenho e qualidade da carne dos animais. Quarenta e cinco novilhos Canchim (22 meses de idade, 345 kg de peso vivo- PV) foram distribuídos, em um delineamento em blocos casualizados, em três tratamentos (rações totais - RTs - com 35% de volumoso): T1 - RT com cana-de-açúcar fresca; T2 - RT com silagem de cana-de-açúcar tratada com hidróxido de cálcio (10 g Ca(OH)2/kg de forragem fresca); T3 - RT com silagem de milho. Foram avaliados o consumo de matéria seca (CMS), consumo de MS digestível (CMSD), consumo de proteína bruta (CPB), eficiência alimentar (EA), ganho médio diário (GMD) e rendimento de carcaça (RC). A carne foi avaliada quanto a parâmetros de qualidade (pH, capacidade de retenção de água, perdas no cozimento, cor e força de cisalhamento) e de análise sensorial descritiva. Os novilhos alimentados com a silagem de cana-de-açúcar tratada com hidróxido de cálcio apresentaram similares (P>0.05) CMS (10,8 kg/d), CMSD (8,5 kg/d) e RC (52,6%); mais alto (P<0.05) CPB (1,8 vs. 1,4 kg/d) e menor (P<0.05) GMD (1,58 vs. 1,81 kg PV/d) comparados aos que receberam silagem de milho. Comparados aos animais alimentados com cana-de-açúcar fresca, os novilhos alimentados com silagem de cana-de-açúcar tratada com hidróxido de cálcio apresentaram maior (P<0.05) CMS (10,9 vs. 9,4 kg MS/d), CMSD (8,70 vs. 7,4 kg/d), CPB (1,8 vs. 1,1 kg/d) e RC (52,7 vs. 51,2%), mas o GMD e EA foram similares (P>0.05) (1,5 kg PV/d e 0,15 kg PV/kg CMS, respectivamente). As diferentes rações não afetaram (P>0.05) os parâmetros de qualidade e os atributos sensoriais da carne, com exceção da cor da gordura e sabor estranho na carne. Concluiu-se que o hidróxido de cálcio pode ser indicado como um eficiente aditivo para...(AU)

This study aimed to evaluate sugarcane (Saccharum officinarum L) silage treated with calcium hydroxide - Ca(OH)2 - (slacked lime) as the only roughage source in a feedlot ration, regarding animal performance and meat quality. Forty five Canchim steers (22 months old, 345 kg body weight - BW) were assigned, in a complete randomized block design, to three treatments (total mixed rations - TMRs - with 35% roughage): T1- TMR with fresh sugarcane; T2 - TMR with sugarcane silage treated with calcium hydroxide (10 g Ca(OH)2/kg of fresh forage); T3 - TMR with corn silage. Dry matter intake (DMI), digestible DM intake (DDMI), crude protein intake (CPI), feed efficiency (FE), average daily gain (ADG) and dressing percentage (DP) were evaluated. Meat was analyzed for quality parameters (pH, water holding capacity, cooking loss, color and shear force) and sensory attributes. Steers fed the silage treated with calcium hydroxide presented similar (P>0.05) DMI (10.8 kg DM/d), DDMI (8.5 kg/d) and DP (52.6%); higher CPI (1.8 vs. 1.4 kg/d) and lower (P<0.05) ADG (1.58 vs. 1.81 kg BW/d) and FE (0.15 vs. 0.17 kg BW/kg DMI) in comparison to those receiving corn silage. Compared to animals fed the fresh sugarcane, steers fed sugarcane silage treated with calcium hydroxide presented higher (P<0.05) DMI (10.9 vs. 9.4 kg DM/d), DDMI (8.7 vs. 7.4 kg/d), CPI (1.8 vs. 1.1 kg/d) and DP (52.7% vs. 51.2%) but similar (P>0.05) ADG and FE (1.5 kg BW/d and 0.15 kg BW/kg DMI, respectively). The different rations did not affect (P>0.05) meat quality parameters and sensory attributes, except for fat color and off flavor sensory attribute. It was concluded that calcium hydroxide can be indicated as an efficient additive for sugarcane ensilage. Feedlot cattle fed TMR containing sugarcane silage treated with Ca (OH)2, as the only roughage source, presented adequate performance and meat quality.(AU)

Effect of the genetic group, production system and sex on the meat quality and sensory traits of beef from crossbred animals.

The crossbreeding of two or more breeds from the Bos taurus and Bos indicus species is an alternative for obtaining high-quality meat from animals adapted to tropical climates. Quality and sensory attributes of beef, mainly its tenderness and flavour, are very important with regard to the consumer's point of view. This study aimed to evaluate the physico-chemical and sensory characteristics of crossbred young bulls and heifers, the offspring of Angus or Limousin bulls and 1/2 Angus + 1/2 Nellore or 1/2 Simental + 1/2 Nellore cows that were finished on feedlot or pasture. Meat quality traits (pH, colour, cooking loss, water holding capacity and shear force) and sensory parameters (characteristic beef aroma/flavour intensity, strange aroma/flavour intensity, tenderness and juiciness descriptive attributes, flavour, texture (tenderness) and overall acceptance) were evaluated. The genetic group had an effect on the beef pH, but it was not as relevant as the effect of the combination between the production system and the sex or genetic group, which affected many of the quality and sensory traits.

Variation in myogenic differentiation 1 mRNA abundance is associated with beef tenderness in Nelore cattle.

The myogenic differentiation 1 gene (MYOD1) has a key role in skeletal muscle differentiation and composition through its regulation of the expression of several muscle-specific genes. We first used a general linear mixed model approach to evaluate the association of MYOD1 expression levels on individual beef tenderness phenotypes. MYOD1mRNA levels measured by quantitative polymerase chain reactions in 136 Nelore steers were significantly associated (P ≤ 0.01) with Warner-Bratzler shear force, measured on the longissimus dorsi muscle after 7 and 14 days of beef aging. Transcript abundance for the muscle regulatory gene MYOD1 was lower in animals with more tender beef. We also performed a co-expression network analysis using whole transcriptome sequence data generated from 30 samples of longissimus muscle tissue to identify genes that are potentially regulated by MYOD1. The effect of MYOD1 gene expression on beef tenderness may emerge from its function as an activator of muscle-specific gene transcription such as for the serum response factor (C-fos serum response element-binding transcription factor) gene (SRF), which determines muscle tissue development, composition, growth and maturation.