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. 2021 May 29;11(6):1604.
doi: 10.3390/ani11061604.

The Impact of Age at First Lambing on Milk Yield and Lactation Length in a Population of Istrian Sheep under Semi-Intensive Management

Ante Kasap  1 , Jelena Ramljak  1 , Boro Mioč  1 , Valentino Držaić  1 , Ivan Širić  1 , Darko Jurković  2 , Marija Špehar  2
Affiliations

The Impact of Age at First Lambing on Milk Yield and Lactation Length in a Population of Istrian Sheep under Semi-Intensive Management

Ante Kasap et al. Animals (Basel). .

Abstract

This study aimed to examine the impact of ewe's age at first lambing (AFL) on days in milk (DIM), average daily milk yield (DMY), and total milk yield (TMY). Symmetrical bimodal distribution of AFL enabled classification of maidens in those mated in the first (47%) or second year of life (53%). After accounting for all available sources of phenotypic variability with the linear mixed model for repeated records, it was estimated that AFL had a statistically significant effect only on DIM (p < 0.001). The litter size had a significant effect only on TMY (p < 0.001), while the effect of the parity was significant for all the examined traits (p < 0.001). The results of the study suggest that prolongation of age at first mating to the second year of life is not justified in dairy-orientated sheep farms. However, more evidence on this issue is needed for generalization, especially considering some other traits that can impact profitability of dual-purpose sheep farms (reproduction traits, growth rate of lambs, etc.).

Keywords: age; first lambing; milk; sheep.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Figures

Figure 1
Figure 1
Distribution of age at first lambing (AFL) of Istrian ewes.
Figure 2
Figure 2
Frequency distribution of phenotypes by parity, month of lambing, and litter size.
Figure 3
Figure 3
Distributions of daily milk yield (DMY), days in milk (DIM), and total milk yield (TMY), classified by litter size, parity, and age at first lambing.
See this image and copyright information in PMC

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