It is commonly known that large litter size leads to lower average birth weights, with more piglets born weighing 01 kg, resulting in a negative impact on piglet growth performance. Conversely, there are few studies showing the long-term impact of low birth weight on productive performance of female piglets selected for the breeding herd.The aim of this study was to evaluate the effects of birth weight on reproductive performance and longevity up to the third farrowing of Landrace x Large White crossbred gilts. For most variables, 835 gilts selected for breeding were included in the analyses. When the analysis concerned the number of days in the herd from birth on wards, data from 1495 females were analyzed. Gilts were retrospectively classified into eight classes of birth weight (BiW), with approximately 12.5% of gilts in each group.Overall,gilts were 196.8±0.6 days old at first estrus manifestation, which occurred in 23.8%, 44.4% and 64.6%
of gilts with in 10,20 and 30 days of boar exposure, respectively,with no difference (P>0.05)among BiW classes. Age at puberty was similar among BiW classes in gilts that showed estrus with in 30 d of boar exposure(P≥0.428), but PG600-gilts weighing 410–1160 g reached the puberty later than those weighing 41400 g(P>0.05). Removal due to anestrous was higher(P≥0.093)in female piglets of 410–990 g (22.9%) compared with the other BiW classes (overall 9.6%). There were no differences among BiW classes in the first (P=0.480) and second (P=0.400) farrowing rate but piglets of 1000-1160 g and 1510–1610 g had lower third farrowing rate (P=0.041) than piglets weighing >1620 g.The total number of piglets born(P=0.08)and piglets born a live(P=0.028) were lower for the lightest BiW class in the first farrowing but they were similar among BiW classes in the second and third farrowing. The percentage of first-mated gilts that reached the third farrowing (68.7%) was not affected by BiW (P>0.05).The third farrowing was reached at 627.4±1.17 days of age on average,with no significant difference among BiW classes (P=0.806).Females born weighing less than 1 kg produced about 4.5 fewer piglets along three parities than the other BiW classes(P≤0.05). Female piglets weighing between 1.0 and 1.28 kg at birth were also negatively affected in terms of lifetime herd days,although to a less extent than those weighing less than 1 kg, in comparison with piglets weighing >1.28 kg. However, the number of herd days, from selection for entry into the breeding herd to the third
farrowing or removal,was not different (P=0.257) among BiW classes.The results of this study show that low
BiW (01 kg) negatively influences the production of piglets and longevity of female swine.
เป็นที่รู้จักกันทั่วไปว่า ขนาดครอกใหญ่ที่นำไปสู่ลดน้ำหนักโดยเฉลี่ยเกิด เพิ่มเติมทรูดเกิดน้ำหนัก กก. 01 ผลกระทบประสิทธิภาพการเจริญเติบโตของลูกสุกร ในทางกลับกัน มีการศึกษาน้อยที่แสดงผลกระทบระยะยาวของน้ำหนักต่ำเกิดประสิทธิภาพประสิทธิผลของหญิงทรูดสำหรับฝูงปรับปรุงพันธุ์ จุดมุ่งหมายของการศึกษานี้เป็นการ ประเมินผลกระทบของน้ำหนักเกิดการสืบพันธุ์และอายุยืนถึงสามเล้าคลอดของพันธุ์พื้นเมือง x สีขาวขนาดใหญ่แก่แม่สุกร สำหรับตัวแปรส่วนใหญ่ 835 แม่สุกรสำหรับพันธุ์ถูกรวมอยู่ในการวิเคราะห์การ เมื่อการวิเคราะห์ที่เกี่ยวข้องจำนวนวันในฝูงแรกเกิดในหอผู้ป่วย ได้วิเคราะห์ข้อมูลจากหญิง 1495 แม่สุกรได้มีจัดชั้นเรียนแปดที่เกิดน้ำหนัก (BiW), ย้อนหลังประมาณ 12.5% ของแม่สุกรในแต่ละกลุ่ม โดยรวม แม่สุกรได้ 196.8±0.6 เก่าที่แรก estrus แสดงถึง ซึ่งเกิดขึ้นใน 23.8%, 44.4% และ 64.6% วันof gilts with in 10,20 and 30 days of boar exposure, respectively,with no difference (P>0.05)among BiW classes. Age at puberty was similar among BiW classes in gilts that showed estrus with in 30 d of boar exposure(P≥0.428), but PG600-gilts weighing 410–1160 g reached the puberty later than those weighing 41400 g(P>0.05). Removal due to anestrous was higher(P≥0.093)in female piglets of 410–990 g (22.9%) compared with the other BiW classes (overall 9.6%). There were no differences among BiW classes in the first (P=0.480) and second (P=0.400) farrowing rate but piglets of 1000-1160 g and 1510–1610 g had lower third farrowing rate (P=0.041) than piglets weighing >1620 g.The total number of piglets born(P=0.08)and piglets born a live(P=0.028) were lower for the lightest BiW class in the first farrowing but they were similar among BiW classes in the second and third farrowing. The percentage of first-mated gilts that reached the third farrowing (68.7%) was not affected by BiW (P>0.05).The third farrowing was reached at 627.4±1.17 days of age on average,with no significant difference among BiW classes (P=0.806).Females born weighing less than 1 kg produced about 4.5 fewer piglets along three parities than the other BiW classes(P≤0.05). Female piglets weighing between 1.0 and 1.28 kg at birth were also negatively affected in terms of lifetime herd days,although to a less extent than those weighing less than 1 kg, in comparison with piglets weighing >1.28 kg. However, the number of herd days, from selection for entry into the breeding herd to the thirdfarrowing or removal,was not different (P=0.257) among BiW classes.The results of this study show that lowBiW (01 kg) negatively influences the production of piglets and longevity of female swine.
การแปล กรุณารอสักครู่..