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首页> 外文期刊>Veterinaria Argentina >Pelvic area evaluation in early bred beef heifers and the relationship with calving.
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Pelvic area evaluation in early bred beef heifers and the relationship with calving.

机译：早育牛小母牛的骨盆区域评估及其与产犊的关系。

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The objective of this study is to evaluate pelvic development in beef heifers to be bred at 15 months of age, from prebreeding to precalving, and to relate it to calving difficulties. Animals from two herds were used: 24 Angus heifers from INTA, Reserva 6 (R6), and 33 Hereford (H) and Angus (A) heifers from a commercial herd (RP). Both groups of animals had natural service with bulls proven for calving easiness. Four pelvic area (AP) measurements were performed using a hydraulic pelvimeter, and frame score (EC), live weight (PV) and sexual development were determined at prebreeding. Calving difficulty was classified as 1: slight, 2: moderate and 3: severe difficulty, and 4: cesarean intervention. Measures were taken at calving for calving difficulty, calf birth weight (PN), and sex of calves. Mean EC of R6 heifers was 1, and 3 and 4 for H and A RP heifers respectively. Average AP (cm2) for R6 heifers for the 4 determinations were: 164.3, 199.4, 213.1 and 224.5 respectively. For RP heifers, average AP were 160.4, 205.5, 507.9 and 221.8, and 170.2, 217.3, 225.4 and 238.4 for H and A breeds respectively. In RP, significant differences (P<0.05) were found between H and A for AP. However, there were no differences (P>0.05) between R6 and RP A heifers. In both herds, AP increased as body size did. Dystocia was 0% for R6 and 9.1% in RP. Mean birth weight was 23.9 kg in R6 and 30.3 kg in RP. The lack of calving difficulties in R6 confirms the effectiveness of the selection program for low birth weight carried out for more than 25 years.
机译：这项研究的目的是评估从预配种到产犊前15个月大的育肥牛小母牛的骨盆发育，并将其与产犊困难联系起来。使用了来自两个牛群的动物：来自INTA的24个安格斯小母牛，Reserva 6（R6）和来自商业牛群（RP）的33个赫里福德（H）和安格斯（A）小母牛。两组动物都有自然服务，公牛被证明容易产犊。使用液压骨盆计进行四次骨盆区域（AP）测量，并在预育时确定框架评分（EC），活重（PV）和性发育。产犊困难分为1：轻微，2：中度和3：严重困难，以及4：剖宫产。产犊时要采取措施，以确保产犊困难，犊牛出生体重（PN）和犊牛性别。 R6小母牛的平均EC分别为H和A RP小母牛的3和4。这4次测定的R6小母牛的平均AP（cm 2 ）分别为：164.3、199.4、213.1和224.5。对于RP小母牛，H和A品种的平均AP分别为160.4、205.5、507.9和221.8，以及170.2、217.3、225.4和238.4。在RP中，AP的H和A之间存在显着差异（P <0.05）。然而，R6和RP A小母牛之间没有差异（P> 0.05）。在这两个畜群中，AP随着体型的增加而增加。 R6的难产为0％，RP的为9.1％。 R6的平均出生体重为23.9 kg，RP的平均出生体重为30.3 kg。 R6中没有产犊困难，这证实了25年来实施的低出生体重选拔计划的有效性。

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