Jang Ki Beom, Duarte Marcos Elias, Purvis Jerry M, Kim Sung Woo
Department of Animal Science, North Carolina State University, Raleigh, NC, 27695, USA.
N.G. Purvis Farm Inc, Robbins, NC, 27325, USA.
J Anim Sci Biotechnol. 2021 Nov 16;12(1):111. doi: 10.1186/s40104-021-00637-4.
Whey permeate is an effective lactose source for nursery pigs and the most benefits are obtained when pigs are at 7 to 11 kg BW. Altering weaning ages could cause different length of early-weaner phases until 7 kg BW and thus it would influence the dietary need of whey permeate during 7 to 11 kg BW of pigs. This study aimed to evaluate if weaning ages would affect the dietary needs of whey permeate for optimum growth performance of pigs at 7 to 11 kg BW.
A total of 1,632 pigs were weaned at d 21 (d 21.2 ± 1.3) or d 25 (d 24.6 ± 1.1) after birth. All pigs had a common early-weaner feeds until they reached 7 kg BW. When pigs reached 7 kg BW within a weaning age group, they were allotted in a randomized complete block design (2 × 4 factorial). Two factors were weaning age groups (21 and 25 d of age) and varying whey permeate levels (7.50%, 11.25%, 15.00%, and 18.75%). Data were analyzed using the GLM and NLIN procedures of SAS for slope-ratio and broken-line analyses to determine the growth response to whey permeate and optimal daily whey permeate intake for the growth of the pigs weaned at different ages.
Pigs weaned at 21 d of age had a common diet for 11 d to reach 7 kg BW whereas pigs weaned at 25 d of age needed 2 d. The G:F of pigs weaned at 25 d of age responded to increased daily whey permeate intake greater (P < 0.05) than pigs weaned at 21 d of age. Breakpoints were obtained (P < 0.05) at 88 and 60 g/d daily whey permeate intake or 17.0% and 14.4% of whey permeate for G:F of pigs weaned at 21 and 25 d of age, respectively.
Pigs weaned at an older age with a short early-weaner phase had a greater growth response to whey permeate intake compared with pigs weaned at a younger age with a long early-weaner phase. Altering weaning ages affected dietary needs of whey permeate for optimum growth performance of pigs from 7 to 11 kg BW.
乳清渗透液是保育猪的一种有效乳糖来源，当猪体重在7至11千克时能获得最大益处。改变断奶年龄会导致早期断奶仔猪阶段直至7千克体重的时长不同，从而会影响猪体重在7至11千克期间对乳清渗透液的日粮需求。本研究旨在评估断奶年龄是否会影响猪体重在7至11千克时为实现最佳生长性能对乳清渗透液的日粮需求。
总共1632头仔猪在出生后第21天（21.2±1.3天）或第25天（24.6±1.1天）断奶。所有仔猪在体重达到7千克之前都采用相同的早期断奶仔猪饲料。当一个断奶年龄组内的仔猪体重达到7千克时，将它们按随机完全区组设计（2×4析因）进行分配。两个因素分别是断奶年龄组（21日龄和25日龄）以及不同的乳清渗透液水平（7.50%、11.25%、15.00%和18.75%）。使用SAS的GLM和NLIN程序对数据进行分析，以进行斜率比和折线分析，从而确定不同年龄断奶仔猪对乳清渗透液的生长反应以及实现最佳生长所需的每日乳清渗透液摄入量。
21日龄断奶的仔猪共用11天的日粮来达到7千克体重，而25日龄断奶的仔猪需要2天。25日龄断奶的仔猪的料重比对每日乳清渗透液摄入量增加的反应比21日龄断奶的仔猪更大（P<0.05）。对于21日龄和25日龄断奶仔猪的料重比，分别在每日乳清渗透液摄入量为88克/天和60克/天或乳清渗透液占比为17.0%和14.4%时获得了转折点（P<0.05）。
与早期断奶阶段较长的幼年断奶仔猪相比，早期断奶阶段较短的大龄断奶仔猪对乳清渗透液摄入量的生长反应更大。改变断奶年龄会影响猪体重在7至11千克时为实现最佳生长性能对乳清渗透液的日粮需求。
