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Eh oh matelots

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Rétroplanning, bilan des séances et evolution des reflexions 

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Rétroplanning, bilan des séances et evolution des reflexions 

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rétroplanning + historique des séances et de nos réflexions

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Contextualisation et état de l'art (explications bibliographiques)

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Contextualisation et état de l'art (explications bibliographiques)

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Aces : contextualisation et état de l'art

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Qualité colostrums ferme expérimentale de Trévarez (tableau classique)

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Qualité colostrums ferme expérimentale de Trévarez (tableau classique)

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Données colostrum et vélages envoyées par Léa le 05/03/, exploitation La Touche

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Données colostrum et vélages envoyées par Léa le 05/03/, exploitation La Touche

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tableau brut de Mr Fichepoil

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Grande facilité d’emploi et des résultats garantis grâce aux cupules déjà imprégnées d’antigène. Économique pour permettre à tous vos élèves de manipuler

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Suivi ACES

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on pète les scores

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The Effect of Parity on the Quality of Colostrum of Holstein Dairy Cows in the Organic Production System

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A special feature of organic production systems is the cows’ significantly lower productivity, which is adapted to environmental conditions. The quantity and quality of colostrum is negatively correlated, high amounts of colostrum are associated with low amounts of immunoglobulins. Cows’ parity is also a modulating factor, and studies have shown an increase in colostral IgG corresponds with increasing parity. This study’s aim was to determine the effect of cows’ parity on colostrum quality, in an organic farm setting. From a basic organic herd of dairy cattle, 40 Polish Holstein–Friesian cows were selected: 10 cows each of primiparous, second lactation, fourth lactation, and fifth lactation. Colostrum and transition milk samples were taken from each cow seven times: twice daily on the 1st and 2nd days after calving (every 12 h), and once daily on the 3rd to 5th days. Multiparous cows’ colostrum had higher levels of total proteins, casein, and non-fat dry matter, versus primiparous. Only cows in the second and fourth lactations produced very good quality colostrum (with immunoglobulins over 50 g/L), meeting standards for immunoglobulin concentration. In conclusion, the production of very good quality colostrum is limited during the first lactation, which may suggest the mammary gland is poorly developed, and, thus, immunoglobulin transport is limited. Variability in the colostrum’s immunoglobulin content from first and second collections post-calving was higher in multiparous versus primiparous cows. Therefore, it should be good practice to freeze colostrum from multiparous cows in case of poor-quality primiparous colostrum.

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The Mode of Grass Supply to Dairy Cows Impacts on Fatty Acid and Antioxidant Profile of Milk

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The optimization of milk production includes a rational use of forages, respect for the environment and offers the best quality to consumers. Milk production based on grass and forages produces healthier milk and it is widely spread throughout the Atlantic arc to maximize milk yield per hectare. However, the mode of offering the grass can have a major influence on milk composition. The aim of this study was to evaluate the effect of grass supply mode (grazing, zero-grazing or ensiling) on dairy cows’ performance, with particular reference to fatty acids and fat-soluble antioxidants concentration. A three by three Latin square experiment was performed with 18 dairy cows. Experimental treatments consisted of exclusive feeding with grass silage and zero-grazing, both offered ad libitum indoors, or grazing for 24 h. The results showed that grazing cows had a higher dry matter intake and greater milk yield than cows feeding on grass silage and zero-grazing, as well as higher concentrations of protein, lactose, nonfat-solids and urea in milk than housed cows. Milk fat from grazing cows had a higher proportion of unsaturated fatty acids than from cows feeding on grass silage and zero-grazing, with significant differences in the proportion of vaccenic and rumenic acids. The 18:1 trans-11 to 18:1 trans-10 ratio is proposed as biomarker to identify the milk produced from the management system of grazing cattle. Milk from grazing cows had a greater proportion of lutein than cows eating grass silage, with the zero-grazing system having intermediate values. In conclusion, the mode of grass supply affects fatty acid and antioxidant profiles of milk.

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En conclusion, on peut dire, au vu de nos résultats, que le réfractomètre est un outil fiable pour mesurer la quantité d’anticorps dans un colostrum et donc sa qualité. De plus, les conditions de mesures en élevage permettent d’assurer des mesures de colostrum justes et fiables.

L’analyse de données et les tests statistiques ont montré une corrélation entre la qualité du colostrum et les paramètres de la figure 1. En effet, grâce à la bibliographie et les résultats de la figure 5, on peut affirmer que la saison de vêlage a un impact sur la qualité du colostrum. De la même manière, les résultats de la figure 7 montrent que la concentration en anticorps du colostrum des vaches est supérieure à celle du colostrum des génisses. Ces résultats sont en adéquation avec la littérature scientifique. Enfin, la figure 6 montre que les vaches nourries à l’ensilage d’herbe produisent un colostrum de meilleur qualité que celles au pâturage. Ceci est en contradiction avec nos recherches bibliographiques.

Ainsi il serait interessant de prolonger les recherches pour éclaircir cette contradiction.

Nous pourrions également vérifier l’influence d’autres paramètres.