| Popis: |
This paper described the preservation of poultry offal by autolysis in the presence of formic acid, the subsequent preparation of broiler feed ingredients by drying the hydrolysate on wheat middlings and maize, and three feeding experiments in which broiler chickens received feed containing the dry hydrolysate. The poultry offal hydrolysate (POH) supplied 3.0–6.7% of the feed dry matter. After drying onto wheat middlings or maize meal, the mixtures supplied 17.5–35.0% of the dry matter of the feeds. In two of the feeding experiments, PCH gave a poorer performance of chickens than did fish meal reference feeds. This was not considered to be due to any palatibility problems or nutritional problems associated with the POH, but to the use of high levels of wheat middlings in the POH feeds. In the other experiment in which all the feeds contained high levels of wheat middlings, no difference in performance was noted between POH feeds and the reference feed, and the performance of all chickens was equal to published standards for the breed used. When poultry offal was processed by rendering and then included in chicken feeds, the performance of the chickens was inferior to that of chickens fed on POH. Bacteriological examination of carcases and feeds demonstrated the absence of a number of potantially pathogenic bacteria. These experiments indicate that POH made as indicated in this paper is palatable to chickens and has potential for use in poultry feeds as a replacement for fish meal and animal proteins. The POH also has a high fat content and would appear to be ideally suited for use in developing countries where ingredients rich in high-quality protein or energy are often expensive or in short supply. |
