Tropicultura (Jan 2000)
Influence du taux de graines de coton dans la ration sur la production et la composition du lait chez la chèvre du sahel burkinabé
Abstract
Effect of Cotton Seed Level on Milk Production and Composition in Burkinabe Sahelian Does. Twenty one early lactating sahelian does were divided into 3 balanced (based on milk production) groups to determine the effect of the level of dietary cottonseed (CS) on the yield and composition of milk. Diet 1 included no cottonseed, diet 2 included 22 % cottonseed and diet 3 included 33 % cottonseed on a dry weight bas/s Milk yield was estimated by weighing the kids before and after suckling, six equally spaced times daily and during a 24-hour-period and, also by milking the does after intraveinous injections of oxytocin. Milk yield, feed intake, body weight changes were monitored during 8 weeks. Milk samples were analysed for solids, fat, crude protein and ash. Intake of dry matter (DM) and crude fat (kg/100 kg body weight) were 4, 2 and 1, 22, 3, 9 and 2, 79, and 3, 7 and 2, 92, respectively for diets 1, 2 and 3. Intake of CS did not affect milk yield ; average daily milk yield was 0, 814, 0, 732 and 0, 803 g/day or 0, 715 ; 0, 755 and 0, 786 kg/kg DMI, respectively for diet 1, 2 and 3. There was no effect of CS intake on milk solids. However, concentration of milk fat was significantly higher (P <0, 05) with 33 % CS than with no CS. Milk fat percentages were 4, 56 ; 5, 52 and 6, 05 % respectively for diets 1, 2 and 3. Concentration of crude protein in milk decreased sligthly with the addition of fat : 3, 79 ; 3, 30 and 16 % respectively for diets 1, 2 and 3. The oxytocin method provided 43, 84 % more milk than the double weighing method. It was concluded that intake of CS may increase milk fat concentration, but not necessarily milk fat yield.
