Effects of cotton seed level on milk production and composition in Burkinabe Sahelian does | Influence du taux de graines de coton dans la ration sur la production et la composition du lait chez la chevre du Sahel burkinabe
2000
Ouedraogo, Z. | Sawadogo, L. (Universite de Ouagadougou, (Burkina Faso). Lab. de Physiologie animale) | Nianogo, A.J.
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 basis 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 (P0,05) with 33/ CS than with no CS. Milk fat 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.
显示更多 [+] 显示较少 [-]