Protein requirements of Texel crossbred lambs

Galvani, Diego Barcelos; Pires, Cléber Cassol; Kozloski, Gilberto Vilmar; Sánchez, Luis Maria Bonnecarrère

doi:10.1016/j.smallrumres.2008.11.003

Cited by 40 publications

(88 citation statements)

References 22 publications

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“…Apparently, the SRNS model tends to overestimate the ADG at higher gain rates (>115 g/day) and to underestimate it in smaller gain rates (<115 g/day) (Figure 2), which may be related to lower efficiency of metabolizable energy utilization for weight gain observed in diets with higher concentration The differences between the prediction of ADG by SRNS and the observed one can be explained also in part by variations in nutritional requirements of animals (Galvani et al, 2008). Besides, SRNS adopts an increase of 15% in the net energy requirements for maintenance for ram or billy, which increases the magnitude of the responses.…”

Section: Resultsmentioning

confidence: 97%

Efficiency of metabolizable energy utilization for maintenance and gain and evaluation of Small Ruminant Nutrition System model in Santa Ines sheep

et al. 2011

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-This study was carried out to estimate efficiencies of the utilization of metabolizable energy for maintenance (k m ) and weight gain (k g ) and to evaluate the Small Ruminant Nutrition System (SRNS) model in predicting dry matter intake and average daily gain of growing Santa Ines sheep. Twenty-four non-castrated Santa Ines sheep, at 50 days of age and with average body weight of 13.00 ± 0.56 kg, respectively, were used. After a 10-day adaptation period, four animals were slaughtered to be used as reference for estimating initial empty body weight and body composition of the other animals.The remaining animals were distributed in a random block design, with the treatments consisting of diets containing different levels of metabolizable energy (2.08, 2.28, 2.47 and 2.69 Mcal/kg of DM), with five replicates. The metabolizable energy use efficiencies for maintenance and for weight gain were calculated from the relationship between the dietary net energy for maintenance and gain and ME concentration in the diets. Evaluation of the SRNS model was performed by adjustment of simple linear regression model between the predicted (independent variable) and observed (dependent variable) values. The estimated energy use efficiency for maintenance (k m ) was 0.70; and for gain weight (kg) it showed to be inversely proportional to the increase of metabolizable energy concentration in the diet. The dry matter intake predicted by the SRNS model did not statistically differ from that observed, but the model overestimated the average daily gain by 5.18%. Those results can contribute to the construction of a database, which could be condensed into several others in a predictive model of performance and feed planning for sheep reared in Brazil.

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Section: Resultsmentioning

confidence: 97%

Efficiency of metabolizable energy utilization for maintenance and gain and evaluation of Small Ruminant Nutrition System model in Santa Ines sheep

et al. 2011

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“…Moreover, the number of data with body composition was too low to take this aspect into consideration precisely. Indeed, it is known that, for the same gain, protein and energy cost may be different depending on the body composition (Galvani et al, 2008). We tried to take into account this aspect indirectly by comparing animal sexes, growth potential and ages without any effect on requirements for the three animal species.…”

Section: Discussionmentioning

confidence: 99%

Nutritional requirements of sheep, goats and cattle in warm climates: a meta-analysis

Salah

Sauvant

Archimède

2014

Animal

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The objective of the study was to update energy and protein requirements of growing sheep, goats and cattle in warm areas through a meta-analysis study of 590 publications. Requirements were expressed on metabolic live weight (MLW = LW 0.75 ) and LW 1 basis. The maintenance requirements for energy were 542.64 and 631.26 kJ ME/kg LW 0.75 for small ruminants and cattle, respectively, and the difference was significant ( P < 0.01). The corresponding requirement for 1 g gain was 24.3 kJ ME without any significant effect of species. Relative to LW 0.75 , there was no difference among genotypes intra-species in terms of ME requirement for maintenance and gain. However, small ruminants of warm and tropical climate appeared to have higher ME requirements for maintenance relative to live weight (LW) compared with temperate climate ones and cattle. Maintenance requirements for protein were estimated via two approaches. For these two methods, the data in which retained nitrogen (RN) was used cover the same range of variability of observations. The regression of digestible CP intake (DCPI, g/kg LW 0.75 ) against RN (g/kg LW 0.75 ) indicated that DCP requirements are significantly higher in sheep (3.36 g/kg LW 0.75 ) than in goats (2.38 g/kg LW 0.75 ), with cattle intermediate (2.81 g/kg LW 0.75 ), without any significant difference in the quantity of DCPI/g retained CP (RCP) (40.43). Regressing metabolisable protein (MP) or minimal digestible protein in the intestine (PDI min ) against RCP showed that there was no difference between species and genotypes, neither for the intercept (maintenance = 3.51 g/kg LW 0.75 for sheep and goat v. 4.35 for cattle) nor for the slope (growth = 0.60 g MP/g RCP). The regression of DCP against ADG showed that DCP requirements did not differ among species or genotypes. These new feeding standards are derived from a wider range of nutritional conditions compared with existing feeding standards as they are based on a larger database. The standards seem to be more appropriate for ruminants in warm and tropical climates around the world.

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“…Slaughtering and sampling procedures were performed as previously reported (Galvani et al 2008) with small modifications. Prior to slaughter, the lambs were fasted for 16 h, and their shrunk body weight (SBW) was recorded immediately after the fast.…”

Section: Comparative Slaughter Trialmentioning

confidence: 99%

Energy requirements for the maintenance and growth of Dorper-Jinzhong crossbred ram lambs

Zhao

YaQian

et al. 2016

Italian Journal of Animal Science

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The sheep industry in China has been rapidly developing in recent years; however, the animals' nutritional requirements under certain conditions have not been thoroughly defined. The objective of this study was to investigate the energy requirements of both the maintenance and growth of Dorper-Jinzhong crossbred ram lambs. Thirty 1/2 Dorper Â 1/2 Jinzhong crossed F1 ram lambs (35 6 0.5 kg of body weight, BW) were randomly selected and divided into five groups in a randomised design for a comparative slaughter trial. The lambs were offered one type of feed at 100%, 65% and 40% of the ad libitum intake. Another 15 lambs were used for the digestibility trial to estimate the metabolisable energy (ME) values of the diet at various feed intake levels. The net energy for maintenance (NE m ) and the ME requirement for maintenance (ME m ) were 286.68 kJ/kg 0.75 of SBW and 437.80 kJ/kg 0.75 of SBW, respectively; the energy efficiency for maintenance (k m ) was 0.655. The net energy for growth (NE g ) values for varying average daily gain (100-350 g) in ram lambs grown from 35 to 50 kg increased from 1.31 to 5.93 MJ/d with an energy efficiency for growth (k g ) of 0.457. Our results suggest that the energy requirements of Dorper-Jinzhong crossbred ram lambs are lower than the requirements recommended by the National Research Council (NRC) and Agricultural and Food Research Council (AFRC).

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Protein requirements of Texel crossbred lambs

Cited by 40 publications

References 22 publications

Efficiency of metabolizable energy utilization for maintenance and gain and evaluation of Small Ruminant Nutrition System model in Santa Ines sheep

Efficiency of metabolizable energy utilization for maintenance and gain and evaluation of Small Ruminant Nutrition System model in Santa Ines sheep

Nutritional requirements of sheep, goats and cattle in warm climates: a meta-analysis

Energy requirements for the maintenance and growth of Dorper-Jinzhong crossbred ram lambs

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