De Rensis F, Gherpelli M, Superchi P, Kirkwood R N
Dipartimento di Salute Animale, Facoltà di Medicina Veterinaria, Universita di Parma, Italy.
Anim Reprod Sci. 2005 Nov;90(1-2):95-100. doi: 10.1016/j.anireprosci.2005.01.017.
The aim of this study was to determine relationships between sow backfat depth, plasma leptin concentrations, and reproductive performance after weaning. On the day of farrowing (day 0), and at weaning (day 21), single blood samples were obtained from 120 mixed-parity sows and their backfat depth (P2) measured. Based on backfat depth at day 0, sows were classified as FAT (>24 mm, n = 16), MEDIUM (16-24 mm, n = 54), or THIN (<16 mm, n = 14). Sows were further classified on the basis of P2 backfat changes during lactation of <2 mm, 2-4 mm, or >4 mm. Reproductive performance was measured as weaning-to-oestrous intervals (WOI) of <6 d, 6-9 days, or > or =10 d, and pregnancy rates. There was a positive relationship (P < 0.0001) between backfat depth at day 0 and backfat loss during lactation. The WOI was not associated with backfat depth at day 0 or 21 (P > 0.1 for both). Pregnancy rate was not associated with backfat depth at day 0 (P > 0.1) but pregnant sows had a greater backfat depth at weaning (16.5 +/- 0.3 and 14.9 +/- 0.6 mm, P < 0.04). Backfat loss during lactation was positively associated with WOI (P < 0.01) and negatively associated with pregnancy rate (P < 0.04). Plasma leptin concentrations were higher (P < 0.001) in FAT sows than in MEDIUM or THIN sows on both days but there was no relationship between plasma leptin concentrations and reproductive performances after weaning. It is concluded that plasma leptin is associated with backfat depth and that loss of backfat depth during lactation is associated with reproductive performance. However, there is no direct association between plasma leptin and reproductive performance.
本研究的目的是确定母猪背膘厚度、血浆瘦素浓度与断奶后繁殖性能之间的关系。在分娩当天（第0天）和断奶时（第21天），从120头不同胎次的母猪采集单份血样，并测量其背膘厚度（P2）。根据第0天的背膘厚度，母猪被分为肥胖组（>24毫米，n = 16）、中等组（16 - 24毫米，n = 54）或消瘦组（<16毫米，n = 14）。母猪还根据哺乳期P2背膘厚度变化分为<2毫米、2 - 4毫米或>4毫米。繁殖性能通过断奶至发情间隔（WOI）<6天、6 - 9天或≥10天以及妊娠率来衡量。第0天的背膘厚度与哺乳期背膘损失之间存在正相关关系（P < 0.0001）。WOI与第0天或第21天的背膘厚度无关（两者P均>0.1）。妊娠率与第0天的背膘厚度无关（P > 0.1），但怀孕母猪断奶时的背膘厚度更大（分别为16.5±0.3和14.9±0.6毫米，P < 0.04）。哺乳期背膘损失与WOI呈正相关（P < 0.01），与妊娠率呈负相关（P < 0.04）。在这两天，肥胖母猪的血浆瘦素浓度均高于中等或消瘦母猪（P < 0.001），但血浆瘦素浓度与断奶后的繁殖性能之间没有关系。研究得出结论，血浆瘦素与背膘厚度有关，哺乳期背膘厚度的损失与繁殖性能有关。然而，血浆瘦素与繁殖性能之间没有直接关联。
