A comparison of nutritionally-related blood metabolites among Nguni, Bonsmara and Angus steers raised on sweetveld

Ndlovu, T.; Chimonyo, M.; Okoh, Anthony I.; Muchenje, Voster; Dzama, K.; Dube, Sikhalazo; Raats, J.G.

doi:10.1016/j.tvjl.2007.09.007

Cited by 48 publications

(59 citation statements)

References 24 publications

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“…In our experiment, glucose concentration decreased during the summer and winter months. This corresponds with the findings of Chimonyo et al (2000), Grunwaldt et al (2005), Fraser et al (2009) and Ndlovu et al (2009). These authors attributed decrease in the concentration of glucose to insufficient nutrition in this period.…”

Section: Discussionsupporting

confidence: 92%

“…In order to precisely examine the relationship between dietary and production factors, the obtaining of detailed information on changes in the internal environment of animal during individual phases of the animals' production life is essential (Rusel and Wright 1983;Cavestany et al 2005). Changes in the concentrations of different metabolites in the blood of extensively reared cattle can be caused, for example, by qualitative or quantitative restrictions in feeding (Agenas et al 2006;Cooke et al 2008;Ndlovu et al 2009). The quality of grazing vegetation can be changed depending on changes in climatic conditions (Chimonyo et al 2000;Brown and Adjei 2001).…”

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confidence: 99%

“…An influence of rearing technology on blood metabolic profile is also evident (Philips et al 1989;Myers et al 1999;Coppo et al 2002;Hickey et al 2003;Blanco et al 2009). Influence of temperature, season and breed on the indicators of the internal environment was studied, too (Doornenbal et al 1988;Thrall et al 2004;Grundwaldt et al 2005;Yokus and Cakir 2006;Ndlovu et al 2009). The concentration of metabolites in animals' blood is an important indicator associated with the production of particular animal products (Rueg et al 1992;Casasus et al 2002;Ban-Tokuda et al 2007).…”

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confidence: 99%

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Blood Plasma Metabolic Profile of Aberdeen Angus Bulls during Postnatal Ontogenesis

et al. 2010

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Selected indicators for the metabolic profile of blood plasma in 22 Aberdeen Angus bulls reared by the extensive method were monitored during postnatal development (from 4 to 564 days of age), including total proteins, albumin, urea, creatinine, glucose, cholesterol, triacylglycerols, bilirubin, alkaline phosphatase, alanine transaminase, aspartate transaminase, tyroxin, triiodothyronine, calcium, inorganic phosphorus, magnesium, potassium, sodium, chlorides, copper, zinc and iron. In assessing the relationship of age to the indicators of the internal environment, values of correlation coefficients for total proteins (r = -0.70; p < 0.01), albumin (r = -0.56; p < 0.01), urea (r = -0.73; p < 0.01), glucose (r = -0.38; p < 0.01) and triiodothyronine (r = -0.82; p < 0.01) were established. Significant relationships were shown between the temperature of the external environment and the amount of total proteins (r = -0.38; p < 0.01), urea concentration (r = -0.41; p < 0.01), ALP (r = 0.58; p < 0.01) and ALT (r = 0.45; p < 0.01) activity. Temperature also showed a significant impact on the concentration of P (r = 0.57; p < 0.01), K (r = -0.69; p < 0.01) and Zn (r = 0.33; p < 0.01). The work yields important information on changes in the indicators of the metabolic profile of the blood plasma of bulls during postnatal development under defined nutritional and temperature conditions that can be used as reference values for evaluating health status as well as nutrition level. Beef cattle, internal environment, blood plasma nutrition status

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confidence: 92%

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confidence: 99%

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Blood Plasma Metabolic Profile of Aberdeen Angus Bulls during Postnatal Ontogenesis

et al. 2010

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“…A possible case may be observed in South Africa, where multiple beef genotypes, such as the indigenous hardy Nguni breed and a large pool of non-descripts/cross-breds, are found in the beef industry. The NG breed has functional characteristics that allow it to perform better than other breeds even during the dry season with poor quality feed (Ndlovu et al, 2009) or during handling at slaughter . The ND genotype, on the other hand, may contain multiple unidentified genes and it comprises 35% of bulls found in the emerging farming sector (Scholtz et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Pre-slaughter effects on bleed-out times and some behavioural and physiological responses of Nguni and non-descript steers

Njisane

Muchenje

2017

SA J. An. Sci.

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The effect of loading, transportation, lairage and slaughter conditions on bleed-out times, behavioural and physiological responses of Nguni and non-descript steers reared extensively on natural pastures was investigated. Twenty Nguni (NG) and 20 non-descript (ND) steers were loaded and transported 120 km from the farm to the abattoir in two groups (TG1 and TG2), each comprised of both genotypes. Some environmental conditions and steer behavioural responses were monitored during on-and off-loading, transportation, lairage, and stunning. Trained observers recorded the posture of the steers during transportation, time-budgets during lairage, avoidance-related behaviour, and vocalization scores at stunning were recorded. The steers were slaughtered in four groups (SG1, SG2, SG3 and SG4) and the number of attempts to stun each steer was recorded. Blood samples were collected from each steer during exsanguination for cortisol, glucose and lactate analysis. It took less time to load (370 s) and off-load (602 s) TG1 than TG2 (420 s and 782 s, respectively). All steers were standing throughout transportation and during the lairage observation period. Avoidance-related behaviour and vocalization in the stunning box were not influenced by genotype. The TG1 steers showed more avoidance behaviour (63.2%) and higher cortisol (140.6 ± 14.50 nmol/L) and lactate (12.4 ± 0.83 nmol/L) levels than TG2 (23.9%; 92.8 ± 15.38; 9.0 ± 0.88, respectively). All SG2 steers showed minimal avoidance behaviour with higher cortisol (175.9 ± 17.24 nmol/L) and lactate (13.5 ± 1.12 mmol/L) levels than other groups. Generally, cortisol and lactate levels were positively correlated (r = 0.70). The 5% vocalization recorded was observed from ND steers, TG1 and SG2. In conclusion, steers of different genotypes displayed similar behavioural and physiological responses to identical pre-slaughter conditions that they were exposed to.

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“…Most studies tend to focus on stress (Ndlovu et al, 2009;Odore et al, 2011) and meat quality 2009b) separately, yet the way an animal is handled before slaughter is likely to affect the quality of the meat (Muchenje et al, 2009a). Furthermore, information on animal stress and how it affects meat quality under practical situations, especially in low throughput abattoirs which have low levels of mechanisation, is generally lacking.…”

Section: Introductionmentioning

confidence: 99%

A survey on the effect of transport method on bruises, pH and colour of meat from cattle slaughtered at a South African commercial abattoir

Vimiso

Muchenje

2013

SA J. An. Sci.

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________________________________________________________________________________ AbstractIn this study the effect of transport method on bruising, ultimate pH (pH u ) and colour of beef (L* = lightness, a* = redness and b* = yellowness) was determined. Cattle transported directly from farms had the highest bruise scores, pH u and the lowest L* values. There were significant correlations between pH u and L*, a* and b* values, (r = -0.45, r = -0.59 and -0.55, respectively), pH u and bruise score (r = 0.34), and L* and bruise score (r = -0.24). There were positive relationships between transport distance and pH u and between distance and bruise score, while the relationship between L* and distance was negative. Percentage of bruised carcasses varied with method of transport: Group 1, 41.1%; Group 2, 63.1% and Group 3, 51.1%. Transport method affected bruising, pH u and colour of beef. ________________________________________________________________________________

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A comparison of nutritionally-related blood metabolites among Nguni, Bonsmara and Angus steers raised on sweetveld

Cited by 48 publications

References 24 publications

Blood Plasma Metabolic Profile of Aberdeen Angus Bulls during Postnatal Ontogenesis

Blood Plasma Metabolic Profile of Aberdeen Angus Bulls during Postnatal Ontogenesis

Pre-slaughter effects on bleed-out times and some behavioural and physiological responses of Nguni and non-descript steers

A survey on the effect of transport method on bruises, pH and colour of meat from cattle slaughtered at a South African commercial abattoir

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