2. Subjects and research methodsContents 1: reproductive productivity evaluation of Landrace sows and YorkshireSubject of research: total 252 sows include 103 Landrace sows and Yorkshire sows 149. In it, sow Ladrace has 37 sows with litter and human domestication 196 66 sows mixed with Yorkshire males with 357 litter; Yorkshire sows have 44 plain with 257 human litter sows and sows with 105 Landrace male with 477 litter from ages 1 to 6 litters are raised in breeding company Vietnam-U.s. Branch Office-Hung yen.Research methods-The target is to collect and track:+ The age of first breeding and calving early years+ Weaning time and time again have refurbished the distribution after weaning+ Distance between two litter lay+ Number of infant/newborn baby numbers live and drive/flash drive+ Number of children to feed, the drive, and the number of kids weaned/drive+ Live newborn rate and survival rate to weaning+ Mass neonatal/infant/volume and drive the+ The volume/drive and volume weaning weaning/head-The method+ Legacy data collection, indicators on productivity of sow reproductive Landrace, Yorkshire from 2011 to November 2015.+ Track, measure and record the data on productivity indicators of reproductive sows Landrace, Yorkshire from December 2015 to 7/2016.+ With the target number: proceed to count the number of infant/litter, the number of biological children out alive/litter, the number of children to feed, litter and of the weaning/litter+ With the target volume: conducting weight determines the volume of piglets in the time of the birth and weaning with a kind of balance at all times. Content 2: determine the TTTA/kg pig weaning of Landrace sows and Yorkshire.Subject of research: total 40 litter consists of 10 human Landrace sows drives, concerted Landrace sows with drive 10 males Yorkshire, Yorkshire sows pure human drive and drive with the male Landrace Yorkshire sows.Research methods-Indicators to collect and track: + Feed for pigs waits mashups (kg) + Feed for sows refurbished I (kg) + Feed for sows refurbished period II (kg) + Feed for sows (kg) + Feed for pigs eat (kg) + Total weight piglets weaned (kg) -The method TTTA/kg pig weaning is determined according to the following formula:
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