Oluyemi J A, Adene D F, Ladoye G O
Trop Anim Health Prod. 1979 Nov;11(4):199-202. doi: 10.1007/BF02237801.
Equal numbers of day old White Rock and Nigerian indigenous male chicks were reared to 10 weeks of age under 4 variables consisting of 2 dietary regimes and 2 regimes of immunity (natural versus vaccinal) to Newcastle disease challenge. Although White Rock grew significantly faster, ate more food and tended to be more efficient in feed utilisation than the indigenous chicks, the mortality of the latter was significantly lower. Growth rate and feed intake were significantly greater, feed efficiency better and prechallenge mortality lower in birds fed on the higher crude protein diet. Prechallenge mortality was significantly lower in birds that had been vaccinated against Newcastle disease.
将等量的一日龄白洛克雄雏鸡和尼日利亚本土雄雏鸡，在4种变量条件下饲养至10周龄，这4种变量包括2种饮食方案和2种免疫方案（针对新城疫攻毒的自然免疫与疫苗免疫）。尽管白洛克雏鸡生长速度明显更快，采食更多饲料，且饲料利用率往往比本土雏鸡更高，但后者的死亡率显著更低。采食较高粗蛋白日粮的鸡，生长速度和采食量显著更高，饲料效率更好，攻毒前死亡率更低。接种过新城疫疫苗的鸡，攻毒前死亡率显著更低。
