肉雞開口料

monica · 發(fā)表于 2007-11-6 22:00:33

把這個文章放在這里，沒有其他意思，目的如下：
1，覺得關(guān)于禽類的開口料，和乳豬教槽料、斷奶料一樣有意義，值得我們探討
2，該文章的結(jié)論是：在0-7天，使用高鈉（0.4% 0.45% ，來自氯化鈉）日糧，體重明顯要高于其他鈉水平及鈉源，飼料轉(zhuǎn)化率也最好。但是這種優(yōu)勢在35天時不再保持，各種鈉來源及水平的試驗(yàn)組，體重和飼料轉(zhuǎn)化率再無區(qū)別。以前也看過一篇類似的文章，不同蛋白源及能量來源的開口料，在后期差異也不再顯著，盡管前7天有區(qū)別。
所以后面想接著說的就是：在豬料中，斷奶料前后的日糧營養(yǎng)對后期的影響究竟如何，是象我們經(jīng)常說的那樣嗎？斷奶的體重對后期影響如何如何。。。，為什么雞上就不是如此呢？是因?yàn)轱曫B(yǎng)時間太短，還是因?yàn)殡u的補(bǔ)償生長能力強(qiáng)？如果是這樣，那我們在作飼料的時候，是不是又多了個思路？
Evaluation of high levels of sodium in broiler pre-starter diets
J.B. Yang
F. Yan and P. W. Waldroup
Abstract:
It has been suggested that high levels of sodium(Na) fed during the 7 days of the chick life will enhance growth rate and improve subsequent performance. The objective of this study was to evaluate different levels of Na fed during the 7 days, using both sodium chloride (NaCl) and sodium bicarbonate (NaHCO3) to also control levels of chloride fed. A diet was formulated to meet nutrient needs of the chick from 0-14 day of age, with nutrient levels typical of those used in the US broiler industry. The base diet contained 0.20%, 0.25%, 0.30%, 0.35%.0.40% and 0.45% from both Na source. Diets was fed in mash. Each of these treatments was assigned to 12 pens of 5 male broiler chicks (Cobb 500) in battery brooders and fed for the first 7 days post hatch. At this time, six of the replicated pens were placed on the diet with 0.20% Na for the remainder of the study through 35 days of age. The other six pens were fed the original levels and sources of sodium for the remainder of the study at 35 day of age. Body weight (BW) and feed intake (FI) were measured at 7, 14, and 35 day of age. Results showed that feeding Na levels of 0.40% and 0.45% , especially when the source was NaCl, resulted in an increase in BW at 7 day of age as compared to those fed the diet with 0.20% Na. There was some carryover effect of this BW increase at 14 day of age but by 35 day of age there were no significant differences in BW among those fed different Na levels from 0 to 7 day or those maintained on the high Na levels to 35 day. Similar effects were observed for feed conversion ratio (FCR); higher levels of Na resulted in improvements at 7 day with no lingering effect at 14 day and 35 day of age. It can be concluded that feeding higher than normal Na level in diets fed from 0 to 7 day of age may result in increase in BW and feed conversion but this effect does not persist to 35 day.