Effect of forage type on milk yield, Chemical composition and clotting properties of milk

Abstract

Summary -Fifty-Iour lactating multiparous cows were used in a 3 x 3 latin square trial. During each 3-week period cows were offered a diet composed either 01 perennial ryegrass silage (11 kg dry matter/dl, or second-cutting cocksloot hay (13 kg dry matter/dl or maize silage (11 kg dry matter/dl. Each diet was supplemented with a mixture 01 barley, soya-bean meal and urea in proportions calculated to keep the overall rations isocaloric and isonitrogenous. The cows led grass silage yielded, respectively, 0.4 (P> 0.05) and 1.9 kg/d (P < 0.01) more milk than those led maize silage or hay, but their milk was signilicantly poorer in proteins and caseins. This result is Iinked to a distribution 01 ingested energy in lavour 01 milk yield rather than the deposition 01 body reserves with the grass silage-based diets. The casein/protein ratio, calcium concentration, pH and rheological characteristics 01 the milk were not signilicantly different between the types 01 lorages. dairy cow / coagulation property / milk composition 1 feeding Résumé -Effet de la nature de la ration de base sur la composition chimique du lait et son aptitude à la coagulation.

Effect of forage conservation (hay or silage) on chemical composition of milk

“…This trial confirmed the beneficial effect of grass silage-based diets on milk production to the detriment of milk solids concentration, as already reported relative to hay (Journet and Dulphy, 1973;Burstedt and Lingvall, 1977;Coulon et al, 1995) or maize silage (Verite and Joumet, 1971 ).…”

“…The differences in performances between hay-and silage-based diets rationed to provide the same amount of energy and protein are generally ascribed to a different distribution of energy between milk production and body reserves, as well as to a dilution effect of secreted milk solids (Journet and Dulphy, 1973;Coulon et al, 1995). In this trial, contrary to that which we observed previously, it would appear that the majority of the differences observed were due to a dilution effect of secreted milk solids.…”

“…The differences observed were relatively moderate (below 1 kg milk and around 1 g/kg for each content) and smaller than those obtained in our previous trials (Coulon and Garel, 1993;Coulon et al, 1995), perhaps because in the latter, hay and silage floral types were different and could have had a specific effect on animal performances (Thomas, 1984a).…”

Physicochemical Characteristics of Curdled Milk and Their Correlation with the Lactic Flora in Chad

“…It should also be noted that the composition and physico-chemical characteristics of milk varies significantly between species and even between races (Soryal et al, 2004). These characteristics are also dependent on the nature of the feed (Sutton, 1989;Coulon et al, 1995.). Dairy products are considered nutrient-rich foods.…”

Esmer ve Siyah Alaca Sağmal İnekler ile Düvelerde İki Farklı Yemleme Programının Karşılaştırılması

“…While some studies (Wyss and Collomb, 2011;Mc Cormick et al 2011) suggested that cows fed either silage or dry hay resulted in similar milk yield and milk composition, others (Coulon et al 1995;Coulon et al 1997;Borreani et al 2007) reported that milk production of the dairy cows fed silage were higher than that of animals received diets based on dry hay as roughage. On the contrary of all these findings, Broderick (1995) indicated that yields of milk and fat corrected milk and percentage of milk components were greater on the all hay group than on the all silage diet without added protein supplement.…”