Effects of back fat changes on reproductive performances of Large White pig in the pregnancy period
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摘要:
母猪的繁殖性能是猪场主要生产指标，而母猪的背膘厚与繁殖性能存在较强的相关性。为研究母猪妊娠期不同阶段调控背膘厚对母猪的繁殖性能的影响，以温氏种猪公司新法系经产大白母猪为研究对象，测定妊娠期各阶段母猪背膘厚及繁殖性能。结果表明：妊娠前期和中期背膘厚调控范围为-2~3 mm母猪繁殖性能最佳；妊娠后期背膘厚调控范围为-2~0 mm母猪繁殖性能最佳。妊娠期母猪背膘厚保持在合适的范围，可以提高其繁殖性能，增加猪场效益。
Abstract:The reproductive performance of sows is one of the main production indicators for pig farms. There is a significant correlation between back fat thickness and reproductive performance of the sow. To study effects of back fat thickness on reproductive performances of sows at different stages of gestation period by regulating, the new French Large White pig from Wens breeding pig company were chosed as subjects. The back fat thickness and reproductive performances were measured at different stages of gestation period. The best reproductive performance of sows appeared in early pregnancy and mid-pregnancy with back fat thickness regulation range of -2 to 3 mm. The best reproductive performance of sows appeared in late pregnancy with back fat thickness regulation range of -2 to 0 mm. Back fat thickness of sow keep in a appropriate range, which can improve its reproductive performance and increase benefits of pig farm.
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Keywords:
- Large White pig /
- gestation period /
- back fat thickness /
- reproductive performance
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表 1 妊娠前期背膘变化与繁殖性能的关系1)
背膘变化/mm 样本数/头 总仔/头 活仔/头 健仔/头 弱仔/头 死胎/头 畸仔率/% 木乃伊率/% 窝重/kg 仔猪重/kg -3 17 12.41±3.62b 11.00±3.71b 9.53±2.83b 1.29±1.40 1.24±1.30 17.65b 11.76 12.84±4.65 1.17±0.13 -2~0 231 14.67±3.29a 13.27±3.07a 11.19±2.71a 1.86±1.90 1.01±1.27 15.15b 25.97 15.41±3.82 1.16±0.19 1~3 110 14.86±3.39a 13.31±3.10a 11.45±2.54a 1.70±1.94 1.25±1.47 12.73b 21.82 15.25±3.71 1.15±0.15 4 4 13.50±4.93ab 13.00±5.03ab 10.25±3.59ab 1.75±2.22 0.25±0.50 50.00a 25 15.45±5.64 1.20±0.13 P 0.04 0.04 0.05 0.63 0.25 0.02 0.59 0.07 0.93 1)测定数据为平均值±标准差；同列数据后凡具有一个相同字母者表示差异不显著(P>0.05) 
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表 2 妊娠中期背膘变化与繁殖性能的关系1)
背膘变化/mm 样本数/头 总仔/头 活仔/头 健仔/头 弱仔/头 死胎/头 畸仔率/% 木乃伊率/% 窝重/kg 仔猪重/kg -3 18 12.67±3.66 11.56±3.49 10.33±2.38 1.06±1.51b 0.78±0.94 11.11 27.78 13.69±4.83 1.18±0.16 -2~0 288 14.88±3.48 13.22±3.28 11.36±2.77 1.68±1.83b 1.25±1.54 23.4 28.82 15.29±4.05 1.15±0.18 1~3 230 14.87±3.53 13.44±3.36 11.16±2.60 2.10±2.00a 0.98±1.42 12.61 27.39 15.36±3.89 1.15±0.18 4 20 14.50±2.57 12.85±2.03 11.10±2.02 1.70±1.81ab 1.10±1.25 5 35 14.29±2.81 1.12±0.16 P 0.07 0.12 0.41 0.02 0.15 0.7 0.75 0.25 0.68 1)同列数据后凡具有一个相同字母者表示差异不显著(P>0.05)
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表 3 妊娠后期背膘变化与繁殖性能的关系
背膘变化/mm 样本数/头 总仔/头 活仔/头 健仔/头 弱仔/头 死胎/头 畸仔率/% 木乃伊/% 窝重/kg 仔猪重/kg -3 8 16.13±3.14 14.63±2.88 11.88±1.55 2.38±1.85 1.50±1.41 37.5 0 16.46±2.93 1.13±0.13 -2~0 395 15.06±3.33 13.32±3.20 11.28±2.74 1.86±1.89 1.33±1.75 13.92 28.1 15.21±3.89 1.14±0.18 1~3 326 14.63±3.41 13.08±3.36 11.03±2.66 1.84±1.67 1.17±1.69 12.74 23.01 15.09±4.20 1.16±0.16 4 20 13.65±4.15 12.65±3.72 11.10±3.35 1.40±1.14 0.80±0.83 1 2 14.37±4.86 1.16±0.21 P 0.09 0.38 0.55 0.58 0.36 0.69 0.37 0.62 0.39
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