Análise bioeconômica de períodos de suplementação proteico-energética na estação seca para novilhas Nelore em pastagem diferida de Urochloa decumbens

Silva, Pedro Henrique Ferreira da; Carvalho, Carlos Augusto Brandão de; Malafaia, Pedro; Garcia, Felipe Z.; Peres, A.A.C.; Souza, Paulo Marcelo de; Barbero, Rondineli Pavezzi; Ferreira, Robson Leandro

doi:10.1590/1678-4162-10511

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…Our study agrees with the findings of Silva et al (2019), comparing short-term (55 days) and long-term (147 days) protein-energy supplementation of beef heifers in the dry season. The authors observed similar body weights in the end of the dry season between treatments and reported greater economic efficiency of short-term protein-energy supplementation.…”

Section: Discussionsupporting

confidence: 92%

Short-term protein-energy supplementation at weaning or in the transition of dry-rainy season on performance of Nellore calves kept on Mombaça or Marandu grasses

Bitencourt,

Montagner,

Marino

et al. 2023

Revista Brasileira De Zootecnia

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The objective was to examine the effect of two short-term proteinenergy supplementation (STPES) strategies at the rearing phase on the performance of Nellore calves grazing on Mombaça or Marandu grasses. The experiment used 72 calves (7-mo old, 229±3.0 kg body weight [BW]) allotted in a completely randomized block design to four treatments in a 2 × 2 factorial arrangement: two forage cultivars (Panicum maximum cv. Mombaça vs. Brachiaria brizantha cv. Marandu) and two STPES (WEAN -STPES immediately after weaning vs. TRAN -STPES in the transition of dryrainy). The WEAN animals received 1 kg day −1 (n = 36) of a protein-energy supplement, whereas TRAN animals were subjected to STPES at 2 g/kg BW day −1 (n = 36), both for 53 days. Every 28 days, calves were weighed to measure performance, and pastures were sampled to evaluate productive and structural traits. Growth performance was analyzed considering a completely randomized block design with a 2 × 2 arrangement of treatment, whereas forage responses included repeated measures. Marandu had a higher forage mass (3,586 kg) than Mombaça (2,890 kg), but there was no difference in forage mass in each cultivar between preconditioning periods. The nutritional composition of Marandu and Mombaça cultivars did not differ and had similar results of in vitro fermentation variables. Stocking rate was higher for WEAN, in the Mombaça pastures. The STPES at weaning on Marandu provided greater gains per area. When applied in the period following the weaning and coinciding with the dry season, the STPES improves the performance of newly weaned calves kept on Marandu and Mombaça grasses.

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Section: Discussionsupporting

confidence: 92%

Short-term protein-energy supplementation at weaning or in the transition of dry-rainy season on performance of Nellore calves kept on Mombaça or Marandu grasses

Bitencourt,

Montagner,

Marino

et al. 2023

Revista Brasileira De Zootecnia

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Towards a comprehensive sustainable assessment of beef cattle systems: integrating bioeconomics and animal science

Kuhn,

Durante Mühl,

Costa

et al. 2024

Acta Sci. Anim. Sci.

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Studies with bioeconomic modeling can be identified in animal science. However, there are distinct typologies associated with the term bioeconomy with different meanings and approaches. The present study aims to examine the Bioeconomy/Bioeconomics approaches used in animal science research and discuss the implications and benefits of integrating these areas of knowledge. The method consisted of systematic literature review with quantitative and qualitative analyzes of the content of articles obtained from the Scopus® database. In the process of searching and analyzing the articles, we defined beef cattle as representative of animal science. Followed the PRISMA Protocol guidelines. The results confirmed that the use of the term bioeconomic has been recurrent in this field of knowledge since 1994. However, the approach given to the term refers mainly to studies combining animal performance (bio) and economic returns (economic) because of variables of interest, evident in the set of indicators reported in the articles analyzed. Despite the relevance of these studies, we discuss some implications and reasons for adopting other bioeconomy approaches in animal science. We conclude that the integration between Bioeconomics and animal science can significantly broaden the scope of analysis, the what relevant to the contemporary challenges of promoting sustainable production systems.

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Intake and digestibility of nutrients during the grazing period in sheep on deferred marandu pastures with four initial heights

Silva¹,

Fonseca²,

Oliveira³

et al. 2021

Semina: Ciênc. Agrár.

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The objective of this study was to verify the effect of reducing in pasture height at the beginning of the deferment period (PHBD) of Brachiaria brizantha cv. Marandu on nutrient intake and digestibility in sheep during winter. The combinations between average sward heights (15, 25, 35 and 45 cm) at the beginning of the deferment period and the times of sward use during the winter were evaluated; intake and digestibility evaluations were carried out at the beginning, middle and end of the grazing period, which lasted 90 days. The experimental design used was completely randomized, with three replications. The parameters evaluated were: intake and digestibility of dry matter (DM), crude protein (CP) and neutral detergent fiber (NDF) and potentially digestible dry matter (pDDM). The pDDM contents were similar in pastures kept with 15 and 25 cm, but higher than those observed in pastures with 35 and 45 cm at the beginning of the deferment period. The NDF contents were lower and the CP and NDF digestibility were higher in 15 and 25 cm deferred pastures than in 35 cm at the beginning of deferment period, except for pastures lowered to 45cm. The improvement in nutritional value of the forage apparently ingested by sheep, promoted by ISP reduction, did not result in a variation in pasture consumption by the animals. DMI, expressed as percentage of body weight (%BW), ranged from 1.10 to 1.63. At the beginning of the grazing period, higher values of pDDM, CP and DM digestibility (DMD) were verified in simulated grazing samples. The same response pattern observed for nutritional value traits also occurred for DMI (g.day-1 and %BW) and CP intake. These were higher at the beginning, than at the middle and end of the grazing period. The use of lower sward heights at the beginning of the deferment period allowed the production of pasture with better nutritional quality, but these changes in the nutritional value of the pasture were insufficient to result in higher nutrient intake and digestibility. Furthermore, there was a reduction in nutritional value of the forage apparently consumed by sheep, in the intake and digestibility of deferred pastures throughout the grazing period, in winter. The lower pastures at the beginning of the deferment period (15 cm) improves the nutritional value of forage and nutrient digestibility at the beginning of the winter grazing period. The nutritional value and intake of deferred forage by sheep are compromised by the grazing period.

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Análise bioeconômica de períodos de suplementação proteico-energética na estação seca para novilhas Nelore em pastagem diferida de Urochloa decumbens

Cited by 4 publications

References 11 publications

Short-term protein-energy supplementation at weaning or in the transition of dry-rainy season on performance of Nellore calves kept on Mombaça or Marandu grasses

Short-term protein-energy supplementation at weaning or in the transition of dry-rainy season on performance of Nellore calves kept on Mombaça or Marandu grasses

Towards a comprehensive sustainable assessment of beef cattle systems: integrating bioeconomics and animal science

Intake and digestibility of nutrients during the grazing period in sheep on deferred marandu pastures with four initial heights

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