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The aim of the study was to establish the relationship between parametres included in the glucose tolerance test (GTT) of heifers aged 9-10 months and their subsequent milk yield and composition in lactation I. Used were 42 Holstein-Friesian heifers selected from the herd with a mean individual yield of 9600 kg milk/year with 4.32% fat and 3.44% protein. Over 24 hrs preceding the GTT the animals were...
The article presents the present state of knowledge about obtaining in vitro embryos from farm animals. This biotechnique includes: in vitro maturation of oocytes, in vitro fertilizing matured oocytes and in vitro culture of embryos. The aim of in vitro production of embryos is to obtain more blastocysts and blastocysts of good quality which will determine the efficiency of embryo transfer and facilitate...
The aim of the study was to estimate the content of functional components of milk in some major cattle breeds. The study was performed in two parts. The first was conducted on Black-and-White (BW) and Polish Red (PR) cows. All animals were kept as one herd at Popielno, and maintained according to the traditional extensive feeding system. Bulk milk samples were used, representing the milk of 349 Simmental...
The objective of this study was to examine the feasibility of identification and selection of cattle embryos based on green fluorescence (GFP-positive) in order to obtain calves carrying an integrated transgene. The construct used (pbLGTNF-EGFP) contained the human tumor necrosis factor alpha (hTNFa) gene fused to the bovine betalactoglobulin promoter (bLG) in plasm id vector pCX-EGFP. In four experiments,...
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