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What does P21 stand for?

P21 stands for post-hatch day 21


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At the same time, the cell activities and exfoliated cells on the wide tips of the villi were commonly observed (Fig. 5b). At 20th day old chicks, the ileal villi were foliate to tongue shaped. The proximal parts of the villi, appeared with epithelial cells which recently replaced the exfoliated cells with no clear outline demarcation but the opening of the goblet cells were observed clearly. The intestinal villi at 1st day showed zigzag appearance was very clear at 10th and 20th day post hatch.
Good breeder and hatchery management, together with an optimised incubation process and transport conditions, will deliver a batch of good quality, uniform day old chicks. However this alone is no guarantee of successful post-hatch.
This section contains general posts about the 2014 Kia Forte Hatch.
World egg production industries rely on a single sex only (female), with the males generally disposed of by carbon dioxide gassing or rapid maceration one or two days post-hatch. Males of layer breeds cannot be raised for meat because it is not economically sound to do so, hence their "hatch and dispatch". The issue was highlighted by Jamie Oliver when he gassed male chicks in front of an audience of celebrities at a 2008 dinner to demonstrate some of the processes currently used in food production.
After chicks hatched, they remained in hatcher until dried and fluffed out, then were placed into a warm brooder (36-37°C). The umbilicus was treated with disinfectant for two days, and the first feeding occurred 24 hours post-hatch. Feedings were spaced at 3-hour intervals for a total of 5 feedings/day: 0700, 1000, 1300, 1600 and 1900 hours, with target weight gains no more than 10% of chick body weight per day.
5 lx), in which they exhibited weaker circadian rhythms. The poultry industry has addressed these weak-light issues by increasing light intensity throughout the entire house, which also increases energy costs. High light intensity is commonly achieved by employing high powered ceiling LEDs (A-19, 8W or more), in conjunction with 23-55W CFLs or incandescent bulbs. Lighting and water consumption pattern Troubling water consumption patterns and the ability of chicks and poults to initiate water consumption is an ongoing discussion. Camera imaging and spatial analysis software have shown that, for the first 24-hr post-hatch.