Effects of lactation month and season on test-day milk yield and milk components in Holstein cows

WOS: 000422710100029This study aims to determine the correlations between the test-day milk yield (TDMY) and the fat and protein content as well as the fat and protein yields in Holstein dairy cows and to investigate the effects of lactation period and sampling season on these parameters. The study material consists of 1.380 records of a total of 151 head of Holstein dairy cows raised on a private farm in Samsun province. In the study, the mean TDMY, fat content, protein content, fat yield and protein yield were recorded as 20.6 +/- 5.10 kg, 3.97 +/- 0.734%, 3.23 +/- 0.276%, 0.81 +/- 0.210 kg and 0.66 +/- 0.160 kg, respectively. The effects of lactation period and sampling season on the TDMY, fat content, protein content, fat yield and protein yield were found statistically significant (P<0.01). Statistically significant negative correlations were determined between the TDMY and the fat and protein content, but positive and statistically significant (P<0.01) correlations between the TDMY and the fat and protein yields. In conclusion, it might be stated that the effects of lactation period and sampling season should also be taken into account to improve milk yield and milk components.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [110 O 821]This study was supported by TUBITAK (Project no: 110 O 821

Influence Of Some Envıronmental Factors On Mılk Yıeld And Mılk Components Traıts In Jersey Cows

WOS: 000485852800016This study was conducted to assess the effects of stage of lactation, parity and sampling season on milk yield and milk components in Jersey cows in Karakoy State Farm, Turkey. The data set consisted of 2657 milk records of 204 Jersey cows collected from September 2011 to December 2013. For this purpose, test day milk yield (TDMY) records and milk samples were taken once a month for 10-month period after parturition. The effect of stage of lactation, parity and sampling season on TDMY, fat percentage, protein percentage, fat yield and protein yield were found statistically significant (P<0.01). TDMY were correlated with fat percentage (-0.235) and protein percentage negatively (-0.254) but with fat yield (0.755) and protein yield positively (0.950) (P<0.01). In conclusion, these results suggest animal breeders that the effects of lactation stage, parity and sampling season may be taken into account in husbandry management to improve the milk yield and milk quality in Jersey cows.TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [110 O 821]This study was supported by TUBITAK (Project no: 110 O 821)

Comparison of Fatty Acid Composition between Female and Male Japanese Quail Meats

The objective of the present study was to compare the proximate analysis, fatty acids composition, omega fatty acids, trans fatty acids (TFAs), and ratio of the total poly unsaturated fatty acid (ΣPUFA) and total saturated fatty acid (ΣSFA) of female and male quail meats. Significant differences were not observed between pH, crude fat, moisture, and ash content of female and male quail meats (p>0.05). The male quail meat had higher fat and ash contents and lower moisture content than those of the female quail meat. The pHs of male and female quail meat were found to be 6.22 and 6.21, respectively. The results of the fatty acid composition analysis showed that C18:1 (42.14–41.23%), C16:0 (24.31–25.76%), C18:2 (13.82–13.42%), and C18:0 (7.49–7.32%) were found as the major fatty acids in the female and male quail meats. Total TFAs, ΣSFA, monounsaturated fatty acids (ΣMUFA), and ΣPUFA content of the female and male quail meats were found to be 2.79–2.82%, 33.22–34.65%, 49.70–48.72%, and 14.29–13.81%, respectively

Investigating proximate composition and fatty acid profile of Longissimus dorsi from Anatolian Water Buffaloes (Bubalus bubalis) raised in similar conditions

Abstract The aim of the present study was to compare the proximate analysis and fatty acid profile of water buffalo meats. Samples were taken from three different local meat suppliers in Baklalı, Orcunlu, and Nakkas villages, Istanbul Province, Turkey. Animals were males 24 months old reaching final live weights of 420-440 kg. Significant differences were observed in pH, moisture, fat, color and fatty acid profile of water buffalo meats (p<0.05 and p<0.01). The results of proximate analysis demonstrated that the pH (5.03-5.46), moisture (48.60-59.73%), fat (18.90-30.02%), ash (2.48-3.56%), protein (15.12-17.65%), ‘L’ lightness (24.38-33.50), ‘a’ redness (9.88-13.81), and ‘b’ yellowness (5.66-8.53) were found in the samples. C14:0, C16:0, C18:0, C16:1, C18:1 and C18:2 content of the water buffalo meats were found to be 1.53-4.15%, 19.99-26.85%, 19.48-34.50%, 2.95-5.33%, 35.37-50.62%, and 1.02-3.56%, respectively. The total SFAs, total MUFAs, total PUFAs, and total UFAs contents of the samples ranged between 40.73 and 60.28%, 38.32 and 55.15%, 1.34 and 4.46%, and 39.72 and 59.27%, respectively

An Application of Bootstrap Technique in Animal Science: Egg Yolk Color Sample

In this study, it was aimed to introduce the Bootstrap technique and to reveal the relationship between measurements of yolk color fan grades and digital colorimeter that is used for determining the yellow color of egg by utilizing this technique. For this purpose, a total of 1350 samples of 15 color grades of Roche yolk color fan and L{*} (lightness), a{*} (redness), b{*} (yellowness) values in the same samples were compared. The means, standard errors and confidence intervals for each color parameters of fan grades have been demonstrated by the Bootstrap technique. The grades of Roche yolk color fan in terms of L{*} values have been divided into 10 groups (P < 0.01), while only divided into 9 groups in terms of b{*} values (P < 0.01). According to the means of Redness (a{*}), all of the Roche yolk color fan grades (15 grades) have been determined as independent from each other (P < 0.01). With the Bootstrap method, the standard error values of means were decreased by 42.03\%, 35.38\% and 30.24\%, respectively, and the confidence intervals were narrowed by the ratio of 42.03\%, 35.38\% and 30.24\%, respectively. The results of the study were compared with the results of the study that was conducted by using Roche yolk color fan which is cheaper but less reliable and by using digital colorimeter method which is expensive but reliable