Faid-Allah E, Mourad Reem S, Saddick E I, Eldahshan E
Department of Animal Production, Faculty of Agriculture, Menoufia University, Shibin Al Kawm, Egypt.
Trop Anim Health Prod. 2025 Jan 11;57(1):23. doi: 10.1007/s11250-024-04271-w.
This article aims to explore milking-ability criteria of Holstein dairy cattle under intensive production system in Egypt and investigate some managerial factors that influence them in dairy farms. The data obtained from five herds belong to a commercial intensive production system farm, Egypt. Data included 3509 records. The values of mean ± SD (CV%) of the milking-ability criteria for Holstein dairy cattle as follow: daily milk yield, kg (dmy), milking duration, min (MD), peak flow rate, kg min (PFR), average flow rate, kg min (AFR), AFR s of milking, AFR s of milking, AFR s of milking, and AFR s of milking were 30.34 ± 6.76 kg, (22.27%); 4.16 ± 0.79 min (19.06%); 3.62 ± 0.79 (21.77%); 0.28 ± 0.11 (39.48%); 1.40 ± 0.49 (36.37%); 1.26 ± 0.50 (39.95%); and 1.96 ± 0.71 (36.05%), kg min, respectively. The milking-time (a.m./p.m.) and the herds' men influenced significantly (P ≤ 0.01) on dMY, and milking-ability criteria. In addition, there was a significant effect (P˃0.05) of cows' dry-period on dMY, MD, PFR and AFR. Also, it was clearly appearing that there was a dramatic significant decrease in daily milk yield and AFR by increase mastitis infection times. Milking-ability criteria in Holstien cattle may be go better via good management, hygiene, and well-trained herds' men. The cubic models are higher in determination coefficient (p ≤ 0.05) than linear models for the curve estimates through the time of lactation period for studied traits. The curve of milk yield and milking-abilities were inconstant all over lactation period.
本文旨在探究埃及集约化生产系统下荷斯坦奶牛的挤奶能力标准，并调查奶牛场中影响这些标准的一些管理因素。数据来自埃及一家商业集约化生产系统农场的五个牛群。数据包括3509条记录。荷斯坦奶牛挤奶能力标准的均值±标准差（变异系数%）如下：日产奶量，千克（dmy）、挤奶持续时间，分钟（MD）、峰值流速，千克/分钟（PFR）、平均流速，千克/分钟（AFR）、挤奶的AFR、挤奶的AFR、挤奶的AFR和挤奶的AFR分别为30.34±6.76千克，（22.27%）；4.16±0.79分钟（19.06%）；3.62±0.79（21.77%）；0.28±0.11（39.48%）；1.40±0.49（36.37%）；1.26±0.50（39.95%）；和1.96±0.71（36.05%），千克/分钟。挤奶时间（上午/下午）和牧工对日产奶量和挤奶能力标准有显著影响（P≤0.01）。此外，奶牛的干奶期对日产奶量、挤奶持续时间、峰值流速和平均流速有显著影响（P＞0.05）。而且，明显可以看出，随着乳腺炎感染次数的增加，日产奶量和平均流速急剧显著下降。通过良好的管理、卫生条件和训练有素的牧工，荷斯坦奶牛的挤奶能力标准可能会更好。对于所研究性状在整个泌乳期的曲线估计，三次模型的决定系数（p≤0.05）高于线性模型。整个泌乳期内，产奶量和挤奶能力的曲线并不恒定。
