Broiler Breeder Production by S Leeson, J D Summers

By S Leeson, J D Summers

A accomplished evaluation of all features of business creation platforms, this booklet presents an updated examine broiler breeder construction and administration. beginning with really good genetic courses as built by means of the first breeders and finishing with chapters on sensible, hands-on elements of breeder administration, the source comprises broad assurance of overall healthiness administration, feeding platforms, environmental keep an eye on, lights courses, and female and male replica. spotting the range of administration structures around the globe, it comprises breeders in either temperate and hot climates in addition to managed surroundings as opposed to curtain-sided housing structures.

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Long sustained clutches are only possible when successive ovipositions (egg laying) lag each other by only a short time. 1 shows the type of pattern that can be expected for birds laying clutches of 9 (90% production), 5 (83% production) or 3 (75% production) eggs in a sequence. 1 Time of day of egg laying in relation to clutch length assuming lights on 5:00 - 22:00 h Successive days 9 egg clutch 5 egg clutch 3 egg clutch 1 6:00 6:30 7:00 2 7:00 8:30 11:00 3 8:00 10:30 15:00 4 9:00 12:30 None 5 10:00 14:30 7:00 6 11:00 None 11:00 7 12:00 6:30 15:00 8 13:00 8:30 None 9 14:00 10:30 7:00 10 None 12:30 11:00 11 6:00 14:30 15:00 12 7:00 None None 26 Reproduction Birds will obviously not lay with such precise timing each day but these types of patterns will appear at the different levels of production.

After 18 weeks, pullets were moved to the breeder houses and given 14h light/d and then 16 h/d at 22 weeks. Egg production through peak production as affected by month of the year is shown in Fig. 1. 1 Effect of month of hatch on egg production Lighting 55 A very clear pattern emerges for maturity throughout the year even though daylength during rearing is different by a maximum of only 2h throughout the year. When the latter part of the growing program coincides with increasing day length, then earlier maturity relative to the standard is seen.

Molting and a subsequent second cycle of lay can be induced by feed withdrawal programs as used for commercial egg layers. There seems to be a good correlation between pre- and post-molt breeder performance, and so it seems advisable only to consider molting flocks that have performed well up to 64 weeks of age. Heavy breeders seem less responsive to feed changes than do commercial layers, and so it may be necessary to combine programs such as high mineral (eg. zinc) together with feed restriction.

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