Exigências nutricionais de bezerros nelores lactentes

Fonseca, Mozart Alves; Filho, Sebastião de Campos Valadares; Henriques, Lara Toledo; Paulino, Pedro Veiga Rodrigues; Detmann, Edênio; Fonseca, E. A.; Benedeti, Pedro Del Bianco; Silva, Leandro Diego da

doi:10.1590/s1516-35982012000500019

Cited by 12 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The significant effect of creep feeding on the weight of calves agreed with Carvalho et al (64). The higher weight of calves with supplementation occurred because, in the supplementation months (summer/autumn), the pasture was in its reproductive stage, decreasing its nutritional value (65). Through a meta-analysis, Carvalho et al (64) reported that the supplemental weight gain increases quadratically with supplementation (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Feed Strategies and Changes of Stocking Rate to Decrease the Carbon Footprint in a Traditional Cow-Calf System: A Simulation Model

Toro-Mújica

2021

Front. Vet. Sci.

View full text Add to dashboard Cite

One of the main production challenges associated with climate change is the reduction of carbon emissions. Increasing the efficiency of resource utilization is one way to achieve this purpose. The modification of production systems through improved reproductive, genetic, feed, and grazing management practices has been proposed to increase technical–economic efficiency, even though the “environmental viability” of these modifications has not always been evaluated. The objective of this study was to evaluate the use of feeding and management strategies on the carbon footprint (CF) and economic variables in the traditional cow–calf system in southern Chile using a simulation model. The modifications evaluated corresponded to combinations of stocking rate, use of creep feeding practices with different supplementation levels, and the incorporation of feed additives to the supplement, using factorial experiments. Additionally, the scenarios were evaluated with and without carbon sequestration. The CF for the baseline scenarios was 12.5 ± 0.3 kg of CO2−eq/kg of live weight (LW) when carbon sequestration was considered and 13.0 ± 0.4 kg of CO2−eq/kg of LW in the opposite case. Changes in stocking rate, supplementation level, and consideration of carbon sequestration in pasture and soil had a significant effect on the CF in all simulated scenarios. The inclusion of additives in the supplement did not have a significant effect on production costs. With regard to reducing greenhouse gas (GHG) emissions, incorporating canola oil presented the best average results. The model developed made the selection of environmentally viable feed strategies or management adaptations possible.

show abstract

Section: Discussionmentioning

confidence: 99%

Evaluation of Feed Strategies and Changes of Stocking Rate to Decrease the Carbon Footprint in a Traditional Cow-Calf System: A Simulation Model

Toro-Mújica

2021

Front. Vet. Sci.

View full text Add to dashboard Cite

show abstract

“…In the CON group, milk contributed with 158-g CP and 353-g fat to the total daily intake of calves, which represent 31 and 150 % (or 50 % more than the required) of the nutritional requirements for protein and fat based on requirement values calculated by Fonseca et al (2012). Therefore, for Zebu crossbred calves that are able to achieve weaning weight 240-270 lb, it is necessary to supplement them, via the use of concentrate from the third month of life or else use the strategy with a shorter milking period of cows, and to offer more milk to calves before weaning.…”

Section: Nutrients Intake By Calves and Performancementioning

confidence: 99%

Effect of feeding strategies on weaning weight and milk production of Holstein × Zebu calves in dual purpose milk production systems

Menezes

Filho

López‐Villalobos

et al. 2015

Trop Anim Health Prod

Self Cite

View full text Add to dashboard Cite

The objective of this study was to evaluate the effect of five feeding strategies on calf weaning weight, and cow milk production and composition in Brazilian Holstein × Zebu cows. A total of 60 cows and their calves were allocated to each of five treatments. Cows in treatments 1, 2 and 3 were milked for 270 days and cows in treatments 4 and 5 were milked for 180 days. Calves in treatment 1 (CON) were not supplemented with concentrate whereas calves from treatment 2 (CLPN) received 1 kg of concentrate daily from 90 to 270 days of age and calves from treatment 3 received 1 kg of concentrated from 180 to 270 days of age. Calves in treatment 4 (CCPS) were supplemented with 1 kg of concentrate from 90 to 180 days of age and calves in treatment 5 (CLPS) were supplemented with 1 kg of concentrate from 90 to 270 days of age. Calves from the CLPS treatment had greater milk and protein intakes (P < 0.05) and greater growth rate than calves from the other treatments. Our results indicate that the traditional system of feeding calves with no concentrate results in a weight gain of 600 g/day. The CLPS treatment produced calves with the highest live weight and growth rate. The nutritional strategy with restricted supply of milk for the calves with concomitantly short-term concentrate supplementation does not improve performance of calves but did increase feed costs.

show abstract

“…As exigências de energia do animal correspondem ao somatório das necessidades de mantença e produção que por sua vez, podem ser divididas em: exigências de energia para crescimento, lactação e gestação (Webster, 1979). Todavia, poucos estudos (Fonseca, 2012a; foram conduzidos no Brasil para estimar as exigências nutricionais dos animais na fase de cria, ou seja, das vacas lactantes e dos bezerros lactentes. Com isso, a partir do conhecimento da produção de leite e das exigências nutricionais dos bezerros, a quantidade de energia e proteína secretada pelo leite pode ser conhecida, o que permitiria estimar o momento em que o leite não fornece quantidades suficientes de nutrientes e, assim, obter o momento correto para que haja a suplementação dos bezerros.…”

Section: Introductionunclassified