Abstract
Article Details: Received: 2020-10-23 | Accepted: 2020-11-27 | Available online: 2021-01-31 https://doi.org/10.15414/afz.2021.24.mi-prap.140-144 The aim of this study was to evaluate lactose in relation to milk production and calving interval in dairy cows of Slovak Spotted cattle. A total of 92,730 lactations from 45,800 dairy cows evaluation from 2015 to 2019 were used for investigating lactose percentage (LP), milk yield (MY), lactose yield (LY), fat percentage (FP), proteins percentage (PP) and calving interval (CI). Data were analysed using the SAS version 9.4 and linear model with fixed effects: herd-years-season (HYS), sire (S), breeding type (BT), coding of milk (Cod-MY) and coding of calving interval (Cod-CI). In the dataset the average of LP was 4.77±0.20 %, while the one of MY, LY, FP, PP and CI were 6,778.53±2,014.18 kg, 325.27±100.45 kg, 3.96±0.47 %, 3.39±0.23 % and 406.66±91.09 days. The correlation of LP with MY, LY, FP, PP and CI was equal to r = 0.1712, r = 0.3157, r = 0.0546, r = 0.1852 and r = -0.0147. These correlation coefficients were statistically highly significant P <0.0001. Among all fixed effects in the analysis of variance of LP, the most relevant effect was observed for HYS (P<.0001). Keywords: cattle, milk components, lactose, calving interval, correlation References Alessio, D. R. M. et al. (2016). Multivariate analysis of lactose content in milk of Holstein and Jersey cows. Semina: Ciencias Agrarias , 37(4), 2641–2652. http://dx.doi.org/10.5433/1679-0359.2016v37n4Supl1p2641 Bolacali, M. and Ozturk, Y. (2018). Effect of non-genetic factors on milk yields traits in Simmental cows raised subtropical climate condition. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia , 70(1), 297–305. https://doi.org/10.1590/1678-4162-9325 Boro, P. et al. (2016). Genetic and non-genetic factors affecting milk composition in dairy cows. 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Highlights
The lactose content makes up the highest percentage portion in milk and is not part of the creation of breeding programs for national breeds for milk production, as they state Sneddon et al (2015) and Haile-Marian, Pryce (2017)
2.2 Coding of breeding type, milk yield and calving interval Dairy cows were divided according to the Herd Book classification to subsequent breed-type groups: S0 – purebred Slovak Spotted with the proportion of foreign breeds less than 12.5%; S1 – cows with the genetic proportion of the Slovak Spotted from 75% to 87.4%; S2 – cows with the genetic proportion of the Slovak Spotted from 50% to 74.9% (Slovak Simmental Breeders Association, 2020)
The population of dairy cows was divided into 3 groups according to the mean milk yield in kg (MY) and calving interval in days (CI): 1. lower than mean minus 1 SD – (M1, CI1), 2. from mean minus 1 SD to mean plus 1 SD – (M2, CI2), 3. higher than mean plus 1 SD – (M3, CI3)
Summary
The lactose content makes up the highest percentage portion in milk and is not part of the creation of breeding programs for national breeds for milk production, as they state Sneddon et al (2015) and Haile-Marian, Pryce (2017). The lactose and other milk components in milk may be used indirect traits related to production, fertility in conjunction with health traits that are important for the economics of farming dairy cows as reported Miglior et al (2007). These traits are characterized by a low value of heredity and largely influenced by environmental traits, especially nutrition as they state in their publications Karcol et al (2017), Juraček et al (2020) and other authors. The evaluation of production traits, reproduction traits and relation between each other in dairy cows shows authors in Slovakia (Bujko et al, 2019 and 2020; Kasarda et al, 2020), Czech (Stadnik et al, 2018) Austria (Costa et al, 2019), Poland (Satoła et al, 2017), Romania (Cziszter et al, 2017; Han and Bobiş, 2019), New Zealand (Sneddon et al, 2015) and other authors who have dealt with the similar areas of research
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