HETEROSIS IN REPRODUCTIVE TRAITS OF LANDRACE X LARGE WHITE CROSSBRED SOWS FROM A LOCAL SWINE BREEDING FARM IN THE PHILIPPINES

Orville L. Bondoc, Joemary F. Isubol, Marc Anthony P. Chua

Abstract


Heterosis estimates were determined for reproductive traits using 2,587 litters of 1,256 sows [i.e. 1,088 Landrace (LDR), 1,048 Large White (LRW), 234 F1 cross (LDR x LRW) and 217 reciprocal R1 cross (LRW x LDR)] produced from January 1, 2017 to June 30, 2018 at a local swine breeding farm. Analysis of litter data showed that reproductive traits in crossbred litters were different than in purebred litters in terms of litter size at birth (LSB, +1.05 piglets), litter size at weaning (LSW, +0.87 piglets), piglet weight at birth (BWt) and at weaning (WWt), both -0.05 kg, number of stillbirths (NSB, -0.22 piglets) and number of mummified piglets (NMP, -0.08 piglets). Heterosis estimates were HLSB =0.33%, HLSW =9.58%, HBWt =-3.38%, HWWt =-0.57%, HNSB =-48.31% and HNMP =-31.06%. Using the repeated measures analysis, crossbred sows had lower age at first farrowing (AFF, -4.5 days) and average farrowing interval (AvFInt, -3.8 days), but higher farrowing index (FI, +0.01 litter), average litter size at weaning (AvLSW, +0.91 piglets) and sow productivity index (SPI, +1.65 piglets per sow per year). Heterosis estimates were HAFF =-1.24%, HAvFInt =-2.27%, HFI =0.61%, HAvLSW =10.56% and HSPI =8.06%.

Keywords


heterosis, reproductive traits, F1 and reciprocal crossbred sows

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