T ทั้งหมด หกห้องถูกยัดเยียดให้ความเข้มของทั้ง T This study investigated the effects of different light intensities provided via an increasing photoperiod program on broiler live performance and processing characteristics. A total of 1,080 male broilers were evenly distributed in 12 rooms. Six rooms were subjected to intensities of either 15 footcandles (FC) from 1 to 51 d
(Bright) ทั้งการรักษาความเข้มมีให้ในโปรแกรมช่วงแสงที่เพิ่มขึ้น (Bright), or 0.5 FC from 1 to 9 d and 0.1 FC from 9 to 51 d (Dim). Both intensity treatments were provided in an increasing photoperiod program (23L:1D, 1 to 9 d;
12L: 12D, 9 การบริโภคอาหารและการ 12L:12D, 9 to 16 d; 14L:10D, 16 to 23 d; 17L:7D, 23 to 30 d; 20L:4D, 30 to 37 d; and 23L:1D, 37 to 51 d). Feed consumption and BW were determined, and feed conversions
ได้รับการพิจารณาและการแปลงฟีดจะถูกคำนวณโดยประมาณรายสัปดาห์ ตายถูก 51 d 30 were calculated approximately weekly. Mortalities were necropsied and recorded daily. At 51 d, 30 birds from each room were processed and cut up to determine
นกจากห้องพักทุกห้องได้รับการประมวลผลและตัดขึ้นเพื่อตรวจสอบน้ำหนักและอัตราผลตอบแทน เริ่มต้นที่ weights and yields. Beginning at 23 and 30 d, respectively BW and feed consumption were greater in the Dim treatment.At 51 d, Dim treatment BW was 4.7% greater and
มากขึ้นและปริมาณอาหารที่กินเป็น3.9% ฟีดแปลงการเผาผลาญและการเสียชีวิตทั้งหมดและสม่ำเสมอ feed consumption was 3.9% greater. Feed conversion,metabolic and total mortality, and BW uniformity were not influenced by light intensity. Weights of lean carcass,
total breast, fillets, tenders, and legs were from 4.9 to 6.2% greater in the Dim treatment, which was proportional to the BW difference and resulted in similar yields of these parts. However, wings were 9.9% heavier in the Dim treatment, which resulted in greater wing yield. Equal fat pad weights resulted in reduced fat pad yield in the
Dim treatment. These results indicate that BW, feed consumption,and most parts weights were increased proportionally by providing 0.1 vs. 15 FC of light intensity via
an increasing photoperiod program, and that only the yields of minor parts were affected by intensity
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