Feeding Value of High-oil Corn for Taiwan Country Chicken

Abstract

The feeding value of high-oil corn fed to Taiwan Country (TC) chicken was examined by measuring apparent metabolizable energy (AME), growth performance, sexual maturity, carcass characteristics, and plasma pigmentation. In a completely randomized design, 870 sex-intermingled one-wk-old chicks were assigned to one of 30 floor pens, 29 birds per pen, and each pen randomly assigned to one of five dietary treatments. The experiment was ended when birds were 16 wk of age. The five dietary treatments varied in main fat sources, which were corn oil (CO), high-oil corn (HOC), lard (LRD), whole soybean (WSB) and yellow corn (YC), respectively. All the diets were formulated isonitrogenously, isocalorically, and of equal lysine and methionine contents except YC, in which equal amounts of YC replaced HOC. The results indicated that feed conversion in HOC was 8% higher (p<0.05) than YC whereas the calculated AME of HOC was only 3.5% to 4.0% higher than that of YC. No significant differences were observed in body weight, body weight gain, feed consumption, feed conversion ratio and ME efficiency for body weight gain among CO, HOC, LRD, and WSB. No significant differences existed in both skin and muscle pigmentation of breast among the five dietary treatments. No significance differences existed in plasma carotenoid content measured at various ages among the five dietary treatments except that birds fed with HOC had less (p<0.05) plasma carotenoids at 16 wk-old. The results indicate that if the price of high-oil corn is no more than 1.05 times that of yellow corn, the dietary cost per kg of body weight gain for TC chickens fed diets containing high-oil corn will be less, although their body weight may be lighter compared to chickens fed diets formulated with other fat sources.

Historical flaws in bioassays used to generate metabolizable energy values for poultry feed formulation: a critical review

“…Tube feeding was a frequently used assay to determine the TME value of feedstuffs, although its use is no longer widespread today (Sibbald, 1976 ; Sibbald and Wolynetz, 1987 ; Sell et al, 2001 ; Wang et al, 2017a ). In such assays, many researchers report the AME or AME n values by subtracting EEL from TME (Lin et al, 2003 ; Tshovhote et al, 2003 ; Pirgozliev et al, 2006 ; Latshaw and Freeland, 2008 ; Zhao et al, 2008 ; Farran et al, 2010 ; Jie et al, 2013 ; Jahanian and Rasouli, 2014 ). This calculation does not take into the account that tube feeding assay applies a longer period of excreta collection (36 to 72 h) for a limited FI.…”

High Ejaculation Frequency Enhances Semen Production in Taiwan Country Chickens

“…In Taiwan, more than 50% of the chicken markets are dominated by TCC (Taiwan Provincial Government, 1998), which is an upgraded local breed. The phenotype of TCC was a single comb, red to black feather, and black shank native breed, which is superior in meat quality, disease resistance, heat tolerance, poor fertility and other characteristics to the commercial broilers (Lee, 1998;Chao and Lee, 2001;Lin et al, 2003). To reduce broodiness, all TCC breeders are housed in individual cages and artificial insemination (AI) has been widely used for commercial production.…”