Study on cortisol,cortisone and prednisolone presence in urine of Chianina cattle breed

The Chianina, one of the oldest and most important cattle breeds of Italy, is now reared all over the world. The Chianina has been known and appreciated since ancient times because, from a nutritional point of view, its meat has no proper rivals. To date, studies have been performed to evaluate the genetic profile of the breed, but knowledge about the chemical profile is generally lacking. Due to the increased interest from farmers regarding breeding of the Chianina, this study proposes a preliminary evaluation of main endogenous urinary corticosteroids (cortisol and cortisone) and most commonly used synthetic one (dexamethasone). Moreover, after recent findings regarding the presence of endogenous prednisolone in the urine of more popular breeds, particular attention was given to analysis of the presence of prednisolone and prednisone, as well. For this aim, the urine samples of 12 young cows and 30 young bulls was collected at the farms and analysed using a fit‐for‐purpose LC‐MS/MS method. The preliminary results of this study show that prednisolone was found only in Chianina females (3 out of 12). Cortisol and cortisone were found at concentrations that showed a high inter‐individual variability, and that were higher in female urine compared to that of males.     

Linear model vs. survival analysis for genetic evaluation of sires for longevity in Chianina beef cattle

The objective of this study was to compare sire EBVs for longevity in Chianina beef cattle estimated with linear models and survival analysis. Two datasets were created, one considered all data (SURVall), the other only uncensored records (SURVun). The linear models were used to analyze longevity measured as three correlated dichotomous (yes/no) measures of survival in the first three parities (LIN-S3) and as an overall measure of lifespan in months (LIN-LPL). Correlation between sire EBVs from the two survival analyses were 0.85. For LIN-S3 the correlations of EBVs across parities were between 0.69 to 0.93. Medium correlations (from 0.50 to 0.62) were found when only uncensored data (SURVun) were compared to the linear model (LIN-S3). Higher correlations (from 0.71 to 0.93) were found when EBV based on both censored and uncensored data (SURVall) were compared to LIN-S3. Heritability was estimated at 0.11, 0.09 and 0.08 for SURVall, SURVun and LIN-LPL, respectively; and 0.05, 0.02 and 0.02, respectively, for survival in the first three parities according to LIN-S3. Linear and non-linear models differed in many aspects; the most precise EBV were obtained when all data was used in the evaluation.     

皮埃蒙特和契安尼娜改良牛肉用潜势测定

选择纯种南阳牛公牛１ 头，皮埃蒙特杂公牛 ２ 头，契安尼娜杂公牛 ２ 头，在日粮成份、用量相同（或相似）的情况下进行为期 ２４４ 天的育肥，结果南阳牛、皮杂牛和契杂牛平均日增重分别为９０６ｇ／ｄ，９６０ ｇ／ｄ 和１１７０ ｇ／ｄ，屠宰结果：南阳牛 、契杂牛和皮杂牛的屠宰率分别为 ６１．０％ 、５８．０％ 和 ６１．８％ ；瘦肉率依次为 ４１．５％ 、４０．９％ 和４２．１％ ；眼肌面积分别为８８．５ｃｍ ２、９１．７ｃｍ ２ 和１４１．０ｃｍ ２；背最长肌面积三个牛种的性能接近，肉的嫩度评分，南阳牛、契杂牛和皮杂牛分别为 ６．４３ 分、５．１４ 分和 ５．８６ 分。     

中英肉牛育肥试验报告

三组试验牛平均日增重为７８８ｇ，２０月龀体重达到４４９．５ｋｇ，屠宰率６０．２％，净肉率５０．８％。本文估消化吸收国外育肥技术的同时，结合国情，初步探索了一套方法。     

中英肉牛育肥试验报告

三组试验牛平均日增重为788g,20月龄体重达到449.5kg,屠宰率60.2％,净肉率50.8％。本次试验在消化吸收国外育肥技术的同时,结合国情,初步探索了一套方法。