Correlation of body condition score of cows and milk production in standard lactation

Abstract

The aim of the study was, within the tested samples of high yielding Holstein-Friesian cows (n = 363), to analyze the significance of the actual level of correlation between the average BCS of cows according to body regions and results in the production of milk indifferent stages and the standard duration of lactation. Differences in average realized BCS in regard to the recommended values in stages of production cycle were highly significant (p ≤ 0.01). In general, realized correlation coefficients, whose significance was tested, were at very low level. The average value of the BCS at dry off period in the first, second and third body region was statistically significantly (p (lt) 0.05) and highly significantly (p (lt) 0.01) positively associated with milk production during the first 100 days of lactation. The mean value of BCS at dry off period in the second body region was in a statistically significant positive correlation (p (lt) 0.05) with the production of milk in the second 100 days and standard lactation. The average value of BCS at dry off period for all three body regions was highly significantly (p (lt) 0.05) positively associated with milk production in the first 100 days. The mean value of BCS at calving in the first body region was highly significantly (p (lt) 0.01) positively associated with milk production during the first and the second 100 days of lactation and standard lactation. Average BCS value at calving for the second body region was highly significantly (p (lt) 0.01) positively correlated with milk production in the first and second 100 days of lactation and significantly positvely correlated (p (lt) 0.05) with the production of milk in the standard lactation. The mean value of BCS at calving in the third body region was highly significantly (p (lt) 0.01) positively correlated with milk production during the first 100 days of lactation and significantly positively correlated (p (lt) 0.05) with the production of milk in the second 100 days and standard lactation. Average BCS value for all three body regions at calving was in a highly significant (p (lt) 0.01) positive correlation with milk production in the first hundred days of lactation. A significant positive correlation (p (lt) 0.05) with the production of milk in the second 100 days and a standard lactation was achieved. The average value of BCS at the peak of lactation for the first, second and third body region was significantly (p (lt) 0.05) and highly significantly (p (lt) 0.01) negatively correlated with the production of milk in a standard lactation. The mean value of BCS at the peak of lactation for all three body regions was very significantly (p (lt) 0.01) negatively correlated with the production of milk in the standard lactation. The mean value of BCS in the mid-lactation for the first, second and third body region was highly significantly (p (lt) 0.01) negatively correlated with the production of milk in the standard lactation. BCS average value for all three body regions in the mid-lactation was very significantly (p (lt) 0.01) negatively correlated with the production of milk in the standard lactation.

Cilj istraživanja bio je da se u okviru ispitivanog uzorka visokomlečnih krava holštajn-frizijske rase (n=363) analizira značajnost ostvarenog nivoa povezanosti između prosečnih vrednosti BCS krava po telesnim regijama i postignutih rezultata u proizvodnji mleka po fazama i standardnom trajanju laktacije. Razlike ostvarenih prosečnih BCS u odnosu na preporučene optimalne vrednosti po fazama proizvodnog ciklusa su visoko značajne (p≤0.01). U celini posmatrano realizovani koeficijenti korelacije, čija je značajnost ispitana, bili su na niskom nivou. Prosečna vrednost BCS na zasušenju u prvoj, drugoj i trećoj telesnoj regiji bila je statistički značajno (p (lt) 0.05) i vrlo značajno (p (lt) 0.01) pozitivno povezana sa proizvodnjom mleka u prvih 100 dana laktacije. Srednja vrednost BCS na zasušenju u drugoj telesnoj regiji bila je u statistički značajnoj pozitivnoj vezi (p (lt) 0.05) sa proizvodnjom mleka u drugih 100 dana i standardnoj laktaciji. Prosečna vrednost BCS na zasušenju za sve tri telesne regije bila je u statistički značajnoj pozitivnoj vezi (p (lt) 0.05) sa proizvodnjom mleka u prvih 100 dana laktacije. Srednja vrednost BCS kod teljenja u prvoj telesnoj regiji bila je vrlo značajno (p (lt) 0.01) pozitivno povezana sa proizvodnjom mleka u prvih i drugih 100 dana i standardnoj laktaciji. Prosečna vrednost BCS kod teljenja u drugoj telesnoj regiji bila je vrlo značajno (p (lt) 0.01) pozitivno povezana sa proizvodnjom mleka u prvih i drugih 100 dana i u značajnoj pozitivnoj vezi (p (lt) 0.05) sa proizvodnjom mleka u standardnoj laktaciji. Srednja vrednost BCS kod teljenja u trećoj telesnoj regiji bila je vrlo značajno (p (lt) 0.01) pozitivno povezana sa proizvodnjom mleka u prvih 100 dana laktacije i u značajnoj pozitivnoj vezi (p (lt) 0.05) sa proizvodnjom mleka u drugih 100 dana i standardnoj laktaciji. Prosečna vrednost BCS za sve tri telesne regije kod teljenja bila je u vrlo značajnoj (p (lt) 0.01) pozitivnoj vezi sa proizvodnjom mleka u prvih sto dana laktacije. Ostvarena je značajna pozitivna veza (p (lt) 0.05) sa proizvodnjom mleka u drugih 100 dana i standardnom laktacijom. Prosečna vrednost BCS na vrhu laktacije u prvoj, drugoj i trećoj telesnoj regiji bila je u značajnoj (p (lt) 0.05) i vrlo značajnoj (p (lt) 0.01) negativnoj vezi sa proizvodnjom mleka u standardnoj laktaciji. Srednja vrednost BCS na vrhu laktacije za sve tri telesne regije bila je u vrlo značajnoj (p (lt) 0.01) negativnoj vezi sa proizvodnjom mleka u standardnoj laktaciji. Srednja vrednost BCS na sredini laktacije u prvoj, drugoj i trećoj telesnoj regiji bila je u vrlo značajnoj (p (lt) 0.01) negativnoj vezi sa proizvodnjom mleka u standardnoj laktaciji. Prosečna vrednost BCS za sve tri telesne regije na sredini laktacije bila je u vrlo značajnoj (p (lt) 0.01) negativnoj vezi sa proizvodnjom mleka u standardnoj laktaciji.