Methods in modelling feeding behaviour and intake in herbivores

Mertens,

doi:10.1051/animres:19960636

Cited by 23 publications

(18 citation statements)

References 22 publications

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“…The intake of dry matter can be a direct reflection of the genetic potential of the animal (Allen, 2000) inasmuch as coordinated actions encompass homeostatic and homeorhetic directions, contributing for the achievement or maintenance of an energy profile (long-term regulation). Nevertheless, meals are conducted daily and, at short intervals, the ingestive behavior is surrounded by external stimuli and the initial part of the digestive tract (Mertens, 1996). Accordingly Dulphy & Demarquilly (1994) reported that, through different mechanisms, each food or ingested ration promote responses from systems of hunger/satiety, which will reflect in meals with varying sizes in the normal circadian cycle of the animal.…”

Section: Resultsmentioning

confidence: 99%

Intake, apparent nutrient digestibility and ingestive behavior of sheep fed cashew nut meal

Pimentel

Pereira

Queiróz³

et al. 2011

R. Bras. Zootec.

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-The objective of this work was to evaluate intake, nutrient apparent digestibility and ingestive behavior of sheep fed rations with cashew nut meal (CNM) at the levels of 0; 10; 20 and 30% in the concentrate ration. It was used a double 4 × 4 Latin square experimental design. Intakes of dry matter (DM), organic matter, crude protein, mineral matter, non-fibrous carbohydrates and total digestible nutrients were not influenced by the addition of CNM, however, intake of neutral detergent fiber (NDF), acid detergent fiber and total carbohydrates presented a quadratic behavior with the increase of content of lipids in the ration. Apparent digestibility of DM, organic matter, crude protein, NDF, acid detergent fiber and non-fibrous carbohydrates was not influenced by the addition of CNM in the rations; however digestibility of ether extract and total carbohydrates presented quadratic and linear behavior, respectively. It was not observed any significant differences in time spent with feeding and rumination, however, total chewing time was influenced, presenting increasing linear behavior with the levels of CNM. Concerning to intakes of dry matter and NDF per hour, feed efficiency and rumination were not affected by increase on lipid content in the rations. Ruminating chews time per rumen bolus, number of ruminated boli and the number of ruminating chews per day were not influenced by experimental rations. In sheep feeding management, it is suggested as a feeding alternative the use of up to 30% of CNM in the concentrate ration if it is available.

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Section: Resultsmentioning

confidence: 99%

Intake, apparent nutrient digestibility and ingestive behavior of sheep fed cashew nut meal

Pimentel

Pereira

Queiróz³

et al. 2011

R. Bras. Zootec.

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“…O consumo de matéria seca é, em essência, reflexo direto do potencial genético do animal (Allen, 2000), no qual ações coordenadas para o modelo determinado de crescimento esquelético, muscular e dos demais tecidos metabolicamente ativos, englobando direcionamentos homeostásicos e homeorréticos, contribuem para o alcance ou manutenção de um status energético de forma contínua (regulação a longo prazo) (Mertens, 1996). No entanto, refeições são realizadas diariamente, sendo o comportamento ingestivo em curtos intervalos (horas, dias), envolvido por estímulos externos e da parte inicial do trato digestivo (Mertens, 1996).…”

Section: Introductionunclassified

“…No entanto, refeições são realizadas diariamente, sendo o comportamento ingestivo em curtos intervalos (horas, dias), envolvido por estímulos externos e da parte inicial do trato digestivo (Mertens, 1996). Cada alimento ou ração ingerida incita, por diferentes mecanismos, os sistemas de fome/saciedade resultando em uma série de refeições de tamanhos distintos, dentro de um ritmo circadiano biológico, com alternâncias entre períodos de ruminação e descanso.…”

Section: Introductionunclassified

Consumo de fibra em detergente neutro por bovinos em confinamento

Detmann

Queiróz²,

Cecon³

et al. 2003

R. Bras. Zootec.

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RESUMO -Objetivou-se avaliar o consumo de fibra em detergente neutro (FDN) por bovinos em confinamento e os principais fatores que influenciam esta variável, correlacionado-a ao consumo de matéria seca (MS) total. Foram avaliados dados publicados na Revista da Sociedade Brasileira de Zootecnia e Revista Brasileira de Zootecnia, no período de 1991 e 2000, totalizando 45 trabalhos científicos e 181 médias de tratamentos. O nível de nutrientes digestíveis totais mostrou-se negativamente correlacionado ao nível de FDN nas dietas (r = -0,6006; P<0,01). A concentração de carboidratos não-fibrosos influenciou de forma negativa a digestibilidade da FDN (DFDN) (r = -0,1631; P<0,09); contudo, nenhum procedimento estatístico empregado permitiu detectar efeitos da DFDN sobre o consumo de MS total (P>0,10). A descrição da relação entre consumo de MS e nível de FDN na dieta foi realizada de forma bifásica, buscando similaridade às curvas propostas por um modelo estático de predição do consumo. A interseção das curvas projetou consumo de FDN (CFDN) de 11,93 g/kg PV. No entanto, a avaliação dos CFDN estimados durante a fase atribuída aos controladores físicos do consumo mostrou inconstância, gerando divergência entre os pontos de consumo máximo de MS e FDN, indicando ser a transição entre os mecanismos físicos e fisiológicos, possivelmente, determinada por um intervalo com interação entre mecanismos. A avaliação do CFDN em função do nível de volumosos nas dietas mostrou perfis estáveis em concentrações superiores a 60%, sendo de 13,53 g/kg PV no intervalo de 80 a 100%. Possíveis interações com a fração indigestível da FDN podem ditar a plasticidade do limite diário de CFDN.Palavras-chave: bovinos, consumo, fibra em detergente neutro, fibra em detergente neutro indigestível Neutral Detergent Fiber Intake by Feedlot CattleABSTRACT -The objective of this work was to evaluate the intake of neutral detergent fiber (NDF) by fedlot cattle, the principal factors that influencing this variable, and to correlate the NDF to total dry matter (DM) intake. The data published at the Brazilian Journal of Animal Science Society and Brazilian Journal of Animal Science among the years of 1991 and 2000, totaling 45 scientific works and 181 averages of treatments, were evaluated. The level of total digestible nutrients was negatively correlated to the level of NDF in diets (r = -0.6006; P<.01). The concentration of non-fibrous carbohydrates influenced in a negative way the digestibility of NDF (NDFD) (r = -0.1631; P <.09); however, no statistical procedure employed allowed to detect effects of NDFD on the total DM intake (P>.10).The description of the relationship among total DM intake and level of NDF in the diet was accomplished using a biphasic profile, looking for similarity to the curves proposed by the static model of DM intake prediction. The intersection of the curves projected a intake of NDF (NDFI) of 11.93 g/kg LW. However, the evaluation of NDFI estimated during the phase attributed to the physical controllers of intake showed inconstan...

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“…Numerous studies have investigated the regulation of feed intake in ruminants (Allen 1996;Forbes 1996;Friggens et al 1998), and, in general, feed intake is considered to result from interacting mechanisms of short, intermediate, and longterm feedback controls (Mertens 1996).…”

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confidence: 99%

Effect of diet and parity on meal patterns of lactating dairy cows

Beauchemin¹,

Maekawa²,

Christensen³

2002

Can. J. Anim. Sci.

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. 2002. Effect of diet and parity on meal patterns of lactating dairy cows. Can J. Anim. Sci. 82: 215-223. Four multiparous and four primiparous lactating dairy cows housed in stalls were used in a double 4 × 4 Latin square to determine the effect of parity and diet on meal patterns. Cows were fed one of four diets: three total mixed rations containing 40, 50, or 60% barley silage on a dry matter (DM) basis, and a diet in which forage and concentrate were allocated separately (SI) containing 50% concentrate. Dry matter intake was similar for all diets (18.2 ± 0.6 kg d -1 ), as were the number of meals per day (10 ± 1 meals d -1 ) and meal duration (35 ± 3 min meal -1 ). Meal size was larger (5.2 vs. 1.1 or 1.9 kg DM meal -1 ), and eating rate was faster (0.265 vs. 0.053 or 0.034 kg DM min -1 ) when cows consumed concentrate, compared with silage or TMR, respectively. Meal size of TMR, silage or concentrate was positively related to DM intake (r = 0.82, 0.76, and 0.98; respectively). For cows consuming TMR, the number of meals per day was negatively related to DM intake (r = -0.41). Dry matter intake increased when meal size increased, primarily as a result of longer meals and, to a lesser extent, faster eating rate. Feeding management had little effect on meal patterns. Multiparous cows tended to eat more in each meal compared with primiparous cows, but both groups spent the same amount of time eating per meal. . La prise de matière sèche était identique dans tous les cas (18,2 ± 0,6 kg par jour), comme le nombre de repas par jour (10 ± 1) et la durée du repas (35 ± 3 minutes par repas). Les portions étaient plus importantes (5,2 c. 1,1 ou 1,9 kg MS par repas) et la consommation plus rapide (0,265 c. 0,053 ou 0,034 kg MS par minute) chez les vaches nourries de concentré que chez celles recevant de l'ensilage ou une RTM, respectivement. On a établi une corrélation positive entre la grosseur de la portion de RTM, d'ensilage ou de concentré et l'absorption de MS (r = 0,82, 0,76 et 0,98, respectivement). Chez les vaches nourries de RTM, on remarque une corrélation négative entre le nombre quotidien de repas et l'absorption de MS (r = -0,41). La prise de matière sèche augmente avec la grosseur de la portion, principalement parce que le repas dure plus longtemps et, dans une moindre mesure, parce que les animaux mangent plus vite. La gestion du régime n'a pas une grande incidence sur les habitudes alimentaires. Les vaches multipares ont tendance (P = 0,17) à consommer plus que les vaches primipares à chaque repas, mais les deux groupes passent autant de temps à manger.

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Methods in modelling feeding behaviour and intake in herbivores

Cited by 23 publications

References 22 publications

Intake, apparent nutrient digestibility and ingestive behavior of sheep fed cashew nut meal

Intake, apparent nutrient digestibility and ingestive behavior of sheep fed cashew nut meal

Consumo de fibra em detergente neutro por bovinos em confinamento

Effect of diet and parity on meal patterns of lactating dairy cows

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