الكاتب: Multiple References

Using on-farm supplementation trials with a P rich block (Phos) and a salt block (Salt), deficiency of P in White Fulani cattle in Nigeria was investigated. There was some evidence, significant in some locations but nonsignificant overall, that P supplemented dams produced heavier calves and supported greater calf growth. Dam mean weight gains, 9 to 1 months pre-partum were 6.9 kg]month on Phos (s.d. = 5"0, n = 50) and 3"Skg]month on Salt (s.d. = 4.7 n = 54) (P > 0"05). Overall least squares means of calf weights at 12 months were 105.2kg (n = 29, s.e. 9.3) on Phos and 91"Skg (n = 37, s.e. 6.3) on Salt (P > 0"05). In animals below 2 years of age, mortalities were 6"8% on Phos and 13"6% on Salt (n = 179, Chi-square P < 0"01). No response to supplementation was observed in older and non-pregnant cattle.