Some factors affecting daily milk yield and composition in a flock of Chios ewes

Ploumi, K.; Belibasaki, S.; Triantaphyllidis, George V.

doi:10.1016/s0921-4488(97)00077-1

Cited by 39 publications

(28 citation statements)

References 4 publications

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“…The stage of lactation had a highly significant effect on all milk components, however only the contents of TS, SNF, F, P and CN increased gradually with the advancement of lactation. The above-mentioned tendency concerning the contents of TS, SNF, F and P is in line with the results published by Casoli et al (1989), Gonzalo et al (1994), Čapistrák et al (1995), Fuertes et al (1998) and Ploumi et al (1998). However, Jelínek et al (1990) and Hassan (1995) reported that during the first 2-5 weeks of lactation the contents of the above-mentioned components decreased as a result of the increased DMY in this period.…”

Section: Resultssupporting

confidence: 88%

Effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling in East Friesian ewes

Kuchtík¹,

Šustová²,

Urban³

et al. 2008

Czech J. Anim. Sci.

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The composition of sheep milk and its production per lactation are influenced by a large number of factors; however, the most important factors are breed, nutrition, health of the animals, environment and the number and stage of lactation. The effect of the stage of lactation on milk composition in different sheep breeds was studied by Jelínek et al. (1990), Maria and Gabina (1993) ABSTRACT:The evaluation of the effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling was carried out over the period of three successive years using milk samples (n = 162) obtained from a total of 27 ewes of the East Friesian (EF) breed, reared on a small sheep farm in Juřinka in the region of Wallachia. The stage of lactation had a highly significant effect on the contents of all milk components. However, only the contents of total solids (TS), solids non-fat (SNF), fat (F), protein (P) and casein (CN) gradually increased with the advancement of lactation. The stage of lactation also had a highly significant effect both on all the properties of milk and the rennet curdling quality (RCQ). All phenotypic correlations between the particular contents of TS, SNF, F, P, CN and urea nitrogen (UN) were positive and high (P ≤ 0.001). On the other hand, all phenotypic correlations between milk yield and particular contents of TS, SNF, F, P, CN and UN were negative and high (P ≤ 0.001). The majority of phenotypic correlations between rennet clotting time (RCT) and the other particular parameters was insignificant. However, the phenotypic correlations between lactose (L) and RCT and between pH and RCT were positive and high (P ≤ 0.001) whereas the phenotypic correlation between titratable acidity (TA) and RCT was negative and high (P ≤ 0.001). The majority of phenotypic correlations between the rennet curdling quality (RCQ) and the other particular parameters was insignificant. Nevertheless, the phenotypic correlations between pH and RCQ and between RCT and RCQ were positive and high (P ≤ 0.001) whereas the phenotypic correlation between TA and RCQ was negative and high (P ≤ 0.001).

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Section: Resultssupporting

confidence: 88%

Effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling in East Friesian ewes

Kuchtík¹,

Šustová²,

Urban³

et al. 2008

Czech J. Anim. Sci.

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“…Low standard deviations and narrower ranges for fat, protein and lactose contents, and milk production have been reported for sheep by other authors (Fuertes et al, 1998;Ploumi et al, 1998;Nudda et al, 2003).…”

Section: Discussionmentioning

confidence: 55%

“…According to those authors, the effects of SCC on milk fat are controversial. Milk yield declined with lactation stage, whereas fat and protein contents increased and lactose content decreased (Ploumi et al, 1998). According to Sevi et al (2004) milk composition in Comisana ewes was affected by the stage of lactation and lambing season.…”

Section: Discussionmentioning

confidence: 92%

Milk yield and composition in line 05 dairy ewes as related to somatic cell counts

Olechnowicz¹,

Jaśkowski²,

Antosik³

et al. 2009

J. Anim. Feed Sci.

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A total of 1512 milk samples from udder halves was collected at monthly intervals from 189 line 05 dairy ewes throughout milking periods. Each ewe was tested 4 times. Milk composition was examined in terms of somatic cell contents (SCC) in ewe milk in three groups: group 0 consisted of ewes that on each test day had ≤250 × 10 3 cells/ml in left and right udder halves, group 1 comprised ewes with ≤250 × 10 3 in one half of the udder and >250 × 10 3 cells/ml in the other half, whereas group 2 contained ewes that had >250 × 10 3 cells/ml in the left and right udder halves (also on each test day). SCC in milk from one or both halves of udders exceeding 250 × 10 3 cells/ml resulted in a statistically significant (P<0.01), 20.7%, decrease in daily milk production.Correlation coefficients between SCC and fat and protein percentages in milk were positive and equaled 0.24 and 0.18, respectively. A negative value of the correlation coefficient was recorded between log SCC and lactose percentage (-0.49).

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“…Environmental factors affecting variability in daily milk yield are widely documented in dairy cattle (Ng-Kwai-Hang et al, 1984;Schutz et al, 1990;Dědková and Němcová, 2003;Rekik et al, 2003), goats (Brežnik et al, 1997;Ciappesonni et al, 2004) and sheep (Gonzalo et al, 1994;CappioBorlino et al, 1997;Ploumi et al, 1998). Studies investigating environmental factors affecting total lactation or milking period yield in goats and sheep (Margetín et al, 1998;Margetín and Milerski, 2000;Čapistrák et al, 2002) were mostly conducted in Slovakia.…”

mentioning

confidence: 99%

Factors affecting milk yield and ewe's lactation curves estimated with test-day models

Oravcová¹,

Margetín²,

Peškovičová³

et al. 2006

Czech J. Anim. Sci.

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Test-day records of purebred Tsigai, Improved Valachian and Lacaune ewes were analysed with a general linear model in order to investigate the effects of flock-test day, lactation number, days in milk, litter size and month of lambing. In total, 121 576 (Tsigai), 247 902 (Improved Valachian) and 2 196 (Lacaune) test-day records gathered over the period [1995][1996][1997][1998][1999][2000][2001][2002][2003][2004][2005] were included in the analyses. Average daily milk yields were 0.604 ± 0.279 kg (Tsigai), 0.595 ± 0.243 kg (Improved Valachian) and 1.053 ± 0.475 kg (Lacaune). The significant (P < 0.05) or highly significant (P < 0.01) effects of flock-test day, lactation number (except for Lacaune), days in milk, litter size (except for Lacaune) and month of lambing (either fixed effects or covariates) tested by Fisher's tests were shown. The model explained about 50% of daily milk yield variability, with coefficients of determination as follows: 0.479 for Improved Valachian; 0.487 for Tsigai; 0.537 for Lacaune. Differences in estimated least-squares means were tested using multiple-range Scheffe's tests. A lower daily milk yield was found for the first lactation, single litter and lactations starting in March in comparison with daily milk yield for the second and third lactations (except for Lacaune), multiple litter and lactations starting in January and February (except for Improved Valachian). AliSchaeffer regression adopted for sheep was used for the fitting of lactation curve according to breed.

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Some factors affecting daily milk yield and composition in a flock of Chios ewes

Cited by 39 publications

References 4 publications

Effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling in East Friesian ewes

Effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling in East Friesian ewes

Milk yield and composition in line 05 dairy ewes as related to somatic cell counts

Factors affecting milk yield and ewe's lactation curves estimated with test-day models

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