肉雞開(kāi)口料

monica · 發(fā)表于 2007-11-6 22:00:33

把這個(gè)文章放在這里，沒(méi)有其他意思，目的如下：
1，覺(jué)得關(guān)于禽類的開(kāi)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(lái)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(shì)在35天時(shí)不再保持，各種鈉來(lái)源及水平的試驗(yàn)組，體重和飼料轉(zhuǎn)化率再無(wú)區(qū)別。以前也看過(guò)一篇類似的文章，不同蛋白源及能量來(lái)源的開(kāi)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(shuō)的就是：在豬料中，斷奶料前后的日糧營(yíng)養(yǎng)對(duì)后期的影響究竟如何，是象我們經(jīng)常說(shuō)的那樣嗎？斷奶的體重對(duì)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(shí)間太短，還是因?yàn)殡u的補(bǔ)償生長(zhǎng)能力強(qiáng)？如果是這樣，那我們?cè)谧黠暳系臅r(shí)候，是不是又多了個(gè)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.