ABSTRACT

1. This study evaluated the performance and meat quality of broiler chickens reared on two litter materials and at two stocking densities.

2. The chicks were allotted in a completely randomised design in a 2 × 2 factorial arrangement with two litter materials (wood shavings or rice straw) and two stocking densities (24 or 30 kg/m²), with six replicates per treatment. Broiler performance, carcase yield, prime cuts, blood plasma proteins, the enzymes alanine aminotransferase and aspartate aminotransferase, edible viscera, immune organs, intestine weight and length, abdominal fat, breast meat colour, pH, weight loss by defrosting, weight loss by cooking and shear force were evaluated.

3. The density of 24 kg/m² positively influenced feed consumption and weight gain. The type of litter had a positive influence on feed conversion, with a lower value for birds raised on wood shavings.

4. Breast production was improved in birds reared at a density of 24 kg/m² when compared to birds reared at a density of 30 kg/m². The rice straw bedding negatively affected abdominal fat (resulting in higher percentages) when compared to birds reared on wood shavings.

5. The types of litter affected the enzyme aspartate aminotransferase in birds raised on wood shavings, although these values were not increased to the point of influence on the physiological functions of broilers.

6. The colour of the breast meat, pH, temperature, weight loss after thawing or cooking, shear force, cholesterol, triglycerides, albumin, total proteins, glucose or alanine aminotransferase content were not influenced by the stocking densities or bedding.

7. The use of wood shavings as poultry bedding at a stocking density of 24 kg/m²resulted in the best performance for broiler chickens at 42 days of age.

摘要

1.这项研究评估了用两种垫料和两种放养密度饲养的肉鸡的性能和肉质。

2.以完全随机的设计，以2×2因子分配方式将小鸡分配给两种垫料（刨花或稻草）和两种放养密度（24或30 kg / m ²），每次处理重复六次。肉鸡性能、,体产量，初切肉，血浆蛋白，丙氨酸氨基转移酶和天冬氨酸氨基转移酶，可食用内脏，免疫器官，肠的重量和长度，腹部脂肪，胸肉颜色，pH，除霜引起的体重减轻，烹饪引起的体重减轻评估剪切力。

3. 24 kg / m ²的密度对饲料消耗和体重增加产生积极影响。垃圾的类型对饲料的转化有积极的影响，用刨花养的鸟的价值较低。

4.与以30 kg / m ²的密度饲养的家禽相比，以24 kg / m ²的密度饲养的家禽的胸脯生产得到改善。与用刨花饲养的鸟类相比，稻草被褥会对腹部脂肪产生负面影响（导致百分比更高）。

5.凋落物的类型会影响刨花饲养的禽类中的天冬氨酸氨基转移酶，尽管这些值并未增加到影响肉鸡生理功能的程度。

6.胸肉的颜色，pH，温度，解冻或烹饪后的体重减轻，剪切力，胆固醇，甘油三酸酯，白蛋白，总蛋白，葡萄糖或丙氨酸氨基转移酶的含量不受放养密度或垫料的影响。

7.以24 kg / m ²的放养密度使用刨花作为家禽床上用品，使42天大的肉鸡表现最佳。