Quantités d'herbe ingérées par les vaches laitières, les génisses et les moutons : effet de quelques facteurs de variation et comparaison entre ces types d'animaux

Dulphy, J.P.; Demarquilly, C.; Rémond, Bernard; L'hôtelier, L.; Ollier, A.; d'Hour, Pascal P.; Giraud, JM; Bony, J.; Rouel, J.

doi:10.1051/animres:19890205

Cited by 3 publications

(1 citation statement)

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“…This amount is also within the range of intakes observed for young animals: 75 g DM/day per kg LW 0.75 for lambs and 79 g DM/day per kg LW 0.75 for heifers (Dulphy et al, 1989). These similarities confirm the potential of raising rabbits on grasslands, whereas limiting complete feed supplementation but without compromising their total intake.…”

Section: Discussionsupporting

confidence: 77%

Herbage intake regulation and growth of rabbits raised on grasslands: back to basics and looking forward

Martin¹,

Duprat²,

Goby³

et al. 2016

Animal

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Organic agriculture is developing worldwide, and organic rabbit production has developed within this context. It entails raising rabbits in moving cages or paddocks, which enables them to graze grasslands. As organic farmers currently lack basic technical information, the objective of this article is to characterize herbage intake, feed intake and the growth rate of rabbits raised on grasslands in different environmental and management contexts (weather conditions, grassland type and complete feed supplementation). Three experiments were performed with moving cages at an experimental station. From weaning, rabbits grazed a natural grassland, a tall fescue grassland and a sainfoin grassland in experiments 1, 2 and 3, respectively. Rabbit diets were supplemented with a complete pelleted feed limited to 69 g dry matter (DM)/rabbit per day in experiment 1 and 52 g DM/rabbit per day in experiments 2 and 3. Herbage allowance and fiber, DM and protein contents, as well as rabbit intake and live weight, were measured weekly. Mean herbage DM intake per rabbit per day differed significantly ( P < 0.001) between experiments. It was highest in experiment 1 (78.5 g DM/day) and was 43.9 and 51.2 g DM/day in experiments 2 and 3, respectively. Herbage allowance was the most significant determinant of herbage DM intake during grazing, followed by rabbit metabolic weight (live weight 0.75 ) and herbage protein and fiber contents. Across experiments, a 10 g DM increase in herbage allowance and a 100 g increase in rabbit metabolic weight corresponded to a mean increase of 6.8 and 9.6 g of herbage DM intake, respectively. When including complete feed, daily mean DM intakes differed significantly among experiments ( P < 0.001), ranging from 96.1 g DM/rabbit per day in experiment 2 to 163.6 g DM/rabbit per day in experiment 1. Metabolic weight of rabbits raised on grasslands increased linearly over time in all three experiments, yielding daily mean growth rates of 26.2, 19.2 and 28.5 g/day in experiments 1, 2 and 3, respectively. The highest growth rate was obtained on the sainfoin grassland despite lower concentrate supplementation. Thus, it seems possible to reduce complete feed supplementation without reducing animal performance. This possibility requires improving our knowledge about organic rabbit production systems and especially grazing and animal health management.

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Section: Discussionsupporting

confidence: 77%

Herbage intake regulation and growth of rabbits raised on grasslands: back to basics and looking forward

Martin¹,

Duprat²,

Goby³

et al. 2016

Animal

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Validation of models commonly used to predict feed intake of lactating dairy cattle

Keady

Mayne

Kilpatrick³

2001

Proc. Br.Soc. Anim. Sci.

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Accurate prediction of daily food intake is a fundamental prerequisite of any nutritional model designed to provide feeding recommendations for lactating dairy cattle. Consequently, much research effort has been expended over the last twenty years in developing food intake prediction models. These range from relatively simple multiple regression models to much more complex theoretical models embracing animal and food characteristics and environmental influences. However, given the major changes in the types of diet now offered to dairy cows, coupled with changes in genetic merit/milk production potential, it is important to examine if the food intake prediction models currently used within the British Isles are appropriate for to-day’s dairy cow. This paper examines the accuracy of prediction of a range of intake models for diets based on grass silage, concentrates and brewers grains.

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Protein Digestion and Intestinal Amino Acids in Dairy Cows Fed Fresh Lolium perenne with Different Nitrogen Contents

Vuuren¹,

Krol-Kramer²,

Lee³

et al. 1992

Journal of Dairy Science

104

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An experiment was carried out to study digestion and intestinal AA in three ruminally and duodenally cannulated, lactating cows fed freshly cut grass (Lolium perenne) fertilized with 500 and 275 kg of N/ha per yr, respectively. High N grass was fed in June and October, and low N grass was offered in July and September. Composite samples of the grass fed in each period also were tested for in situ degradation of OM, CP, and NDF. When low N grass was fed, the digestibilities of OM and CP were lower than when high N grass was fed. On low N grass, the duodenal N flow expressed per unit of N intake was higher, although the flow of AA N on low N grass was reduced in September, mainly because of reduced microbial protein synthesis from slower OM degradation of low N grass. Duodenal N flow per unit of N intake was related negatively to the N:OM ratio of the diet. The rate of N fertilization had no effect on ruminal OM and NDF turnover rates. Turnover and passage rates in this experiment were not different from reported data on cows on winter rations with similar DMI.

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Quantités d'herbe ingérées par les vaches laitières, les génisses et les moutons : effet de quelques facteurs de variation et comparaison entre ces types d'animaux

Cited by 3 publications

References 1 publication

Herbage intake regulation and growth of rabbits raised on grasslands: back to basics and looking forward

Herbage intake regulation and growth of rabbits raised on grasslands: back to basics and looking forward

Validation of models commonly used to predict feed intake of lactating dairy cattle

Protein Digestion and Intestinal Amino Acids in Dairy Cows Fed Fresh Lolium perenne with Different Nitrogen Contents

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