Nguni牛的奶牛效率、相对出生体重和断奶前后续生长性能

Q3 Veterinary

American Journal of Animal and Veterinary Sciences Pub Date : 2022-02-01 DOI:10.3844/ajavsp.2022.113.121

T. J. Mpofu, K. Nephawe, M. Ginindza, N. A. Siwendu, B. Mtileni

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引用次数: 0

摘要

通讯作者：南非比勒陀利亚茨瓦内科技大学动物科学系Takalani Judas Mpofu电子邮件：mpofutj@tut.ac.za摘要：本研究的目的是评估影响南非林波波省Nguni牛断奶前生长性能的因素。考虑的因素包括产仔时的筑坝重量、农业生态区、出生季节、小牛性别、产次和筑坝年龄。本研究使用了来自Nguni奶牛及其小牛（n=826）的数据，包括小牛出生体重（BW）、断奶体重（WW）和产仔时的母牛体重。根据产仔时的重量，将水坝分为高（>385公斤）、中（326-385公斤）和低（<326公斤）三类。计算SAS（2015）的一般线性模型（GLM）程序来分析数据；使用Fisher最小显著性差异（LSD）检验来分离平均值。产仔时的水坝重量影响CE、R-BW、WW和P-ADG，但不影响BW。与较重的水坝相比，较轻和平均的水坝具有较高的CE（36.74；35.04 Vs30.01%）、RBW（8.04；7.12 Vs6.28%）、WW（116.80；116.62 Vs115.13 kg）、P-ADG（0.447；0.446 Vs0.438 kg/d）和P-WG（91.72；91.40 Vs89.77 kg）。湿润区动物的CE（35.32%）、WW（117.53 kg）、P-ADG（0.452 kg/天）和P-WG（92.86 kg）较高。与湿润区相比，干旱区动物的CE、WW、P-ADG和P-WG较低。出生季节影响R-BW和断奶前的生产性状，但不影响CE。夏季小牛的WW（116.78千克）、P-ADG（0.448千克/天）、P-WG（91.96千克）较高。小牛的性别、产次和损伤影响了除R-BW和BW外的所有性状。与雌性小牛相比，雄性小牛的CE（34.79%）、WW（126.20公斤）、P-ADG（0.491公斤/天）和P-WG（100.71公斤）更高。第五次（第五次）产次的母鼠具有较高的CE（37.00%）、R-BW（7.18%）、WW（127.01 kg）、P-ADG（0.495 kg/d）和PWG（101.53 kg）。七（7）年龄的大坝具有较高的CE（42.32%）、WW（143.33 kg）、P-ADG（0.590 kg/d）和P-WG（121.17 kg）。研究结果表明，与较重的奶牛相比，用较轻的奶牛繁殖会使小牛具有类似甚至更好的生长特性。

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Cow Efficiency, Relative-Birth Weight and Subsequent Pre-Weaning Growth Performance of Nguni Cattle

Corresponding Author: Takalani Judas Mpofu Department of Animal Science, Tshwane University of Technology, Pretoria, South Africa Email: mpofutj@tut.ac.za Abstract: The objective of this study was to evaluate factors influencing Cow Efficiency (CE), Relative-Birth Weight (R-BW), and subsequent pre-weaning growth performance of Nguni cattle in Limpopo Province, South Africa. Factors that were considered were dammed weight at calving, agro-ecological zone, the season of birth, sex of calves, parity, and dam age. Data from Nguni cows and their calves (n = 826) consisting of calf Birth Weight (BW), Weaning Weight (WW), and Dam Weight at calving were used in this study. Dams were classified according to their weights at calving into high (>385 kg), medium (326-385 kg), and low (<326 kg) categories. The General Linear Model (GLM) procedure of SAS (2015) was computed to analyze data; the means were separated using Fisher's Least Significant Difference (LSD) test. Dam weight at calving influenced CE, R-BW, WW, and P-ADG, but did not influence BW. Lighter and average dams had higher CE (36.74; 35.04 Vs 30.01%), RBW (8.04; 7.12 Vs 6.28%), WW (116.80; 116.62 Vs 115.13 kg), P-ADG (0.447; 0.446 Vs 0.438 kg/day) and P-WG (91.72; 91.40 Vs 89.77 kg) compared to heavier dams. Animals in the humid zone had higher CE (35.32%), WW (117.53 kg), P-ADG (0.452 kg/day), and P-WG (92.86 kg). Animals in arid yielded lower CE, WW, P-ADG, and P-WG compared to those in humid zone. Season of birth influenced R-BW and pre-weaning performance traits, however, it did not influence CE. Higher WW (116.78 kg), P-ADG (0.448 kg/day), P-WG (91.96 kg) were recorded for summer calves. The sex of calves, parity, and damage influenced all traits except R-BW and BW. Dams with male calves had higher CE (34.79%), WW (126.20 kg), P-ADG (0.491 kg/day), and P-WG (100.71 kg) compared to their female counterparts. Dams on the fifth (5th) parity had higher CE (37.00%), R-BW (7.18%), WW (127.01 kg), P-ADG (0.495 kg/day) and PWG (101.53 kg). Seven (7) years old dams had higher CE (42.32%), WW (143.33 kg), P-ADG (0.590 kg/day), and P-WG (121.17 kg). The findings indicate that breeding with lighter cows would result in calves with comparable or even better growth traits than heavier cows.

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来源期刊

American Journal of Animal and Veterinary Sciences Veterinary-Veterinary (all)

CiteScore

1.90

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0.00%

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期刊介绍： American Journal of Animal and Veterinary Sciences, a quarterly, peer reviewed publication and is dedicated for publication of research articles in the field of biology of animals and with the scientific understanding of how animals work: from the physiology and biochemistry of tissues and major organ systems down to the structure and function of bio molecules and cells; particular emphasis would given to the studies of growth, reproduction, nutrition and lactation of farm and companion animals and how these processes may be optimized to improve animal re- productivity, health and welfare. Articles in support areas, such as genetics, soils, agricultural economics and marketing, legal aspects and the environment also are encouraged. AJAVS is an important source of researcher to study articles on protection of animal production practices, herd health and monitoring the spread of disease and prevention in both domestic and wild animals.