Arcos-Álvarez Darwin, Canul-Solís Jorge, García-Herrera Ricardo, Sarmiento-Franco Luis, Piñeiro-Vazquez Ángel, Casanova-Lugo Fernando, Tedeschi Luis O, Gonzalez-Ronquillo Manuel, Chay-Canul Alfonso
División Académica de Ciencias Agropecuarias, Universidad Juárez Autónoma de Tabasco, 86280 Villahermosa, Mexico.
Tecnológico Nacional de México/ Instituto Tecnológico de Conkal, 97345 Conkal, Mexico.
Animals (Basel). 2020 Mar 20;10(3):518. doi: 10.3390/ani10030518.
The study aimed to evaluate the relationship between udder measurements and milk yield (MY) in dairy Pelibuey ewes. Udder measurements were taken twice a week for eight weeks before (initial) and after (final) milking, including udder depth (UD), udder circumference (UC), udder width (UW), teat length (TL) and teat diameter (TD) in 38 multiparous ewes. Additionally, udder volume (UV) and the difference (VDF) between initial UV (UVi) and final (UVf) was calculated as VDF = UVi - UVf. The MY varied from 0.10 kg/d to 1.04 kg/d, with a mean of 0.39 kg/d, ± 0.18 kg/d. Initial UC (UCi) ranged from 25.80 cm to 53.30 cm, and VDF varied from 1 cm to 2418 cm. The TL and TD were not correlated with MY ( > 0.05), while UCi, UVi and VDF were positively correlated with MY ( < 0.0001; = from 0.66 to 0.74). For the prediction of MY, the obtained equations had an ranging from 0.54 to 0.63. The UCi, UDf, UWi and UWf were included in these models ( < 0.05). It is concluded that there was an acceptable correlation ( = 0.60) between the measurements of the udder, the volume of the udder and the daily milk yield in Pelibuey sheep. When direct measurements of milk production cannot be performed in practice, the measurement of udders and their volume could be a viable alternative to estimate milk yield production as an indirect method.
本研究旨在评估佩利布埃羊乳房测量值与产奶量（MY）之间的关系。在38只经产母羊中，在挤奶前（初始）和挤奶后（最终）的八周内，每周进行两次乳房测量，包括乳房深度（UD）、乳房周长（UC）、乳房宽度（UW）、乳头长度（TL）和乳头直径（TD）。此外，计算乳房体积（UV）以及初始UV（UVi）与最终UV（UVf）之间的差值（VDF），即VDF = UVi - UVf。MY从0.10千克/天到1.04千克/天不等，平均为0.39千克/天，±0.18千克/天。初始UC（UCi）范围为25.80厘米至53.30厘米，VDF范围为1厘米至2418厘米。TL和TD与MY无相关性（>0.05），而UCi、UVi和VDF与MY呈正相关（<0.0001；相关系数从0.66至0.74）。对于MY的预测，所得到的方程的相关系数范围为0.54至0.63。这些模型纳入了UCi、UDf、UWi和UWf（<0.05）。得出的结论是，佩利布埃羊的乳房测量值、乳房体积与日产奶量之间存在可接受的相关性（相关系数 = 0.60）。当在实际操作中无法直接测量产奶量时，测量乳房及其体积作为一种间接方法可能是估计产奶量的可行替代方法。
