在现代化牧场的运营体系中,青年牛作为除成母牛之外的核心群体,其存栏量约占牧场总存栏数的30%,同时也是牧场第二大饲养成本支出项。青年牛的生长健康状况、配种时机的选择以及受孕率,直接决定了牧场投入与产出的经济效益水平。从牧场整体生产规划来看,青年牛的投产进度不仅影响泌乳牛群的平均胎次结构,更对整个牛群的平均产奶量起着关键保障作用。行业实践表明,青年牛首次产犊的理想月龄为22~24 个月,这一目标的实现需要青年牛具备优良的繁殖能力,而优良的繁殖性能最终将转化为更高的牛奶产量,为牧场创造更多经济价值。
In modern dairy farm operations,heifers represent a core group alongside mature cows,accounting for approximately 30% of the total herd inventory and constituting the second-largest expense in farm rearing costs. The growth health status of heifers,the timing of breeding,and conception efficiency directly determine the economic benefits of farm input and output. From the perspective of overall farm production planning,the calving progress of heifers not only influences the average parity structure of the lactating herd but also plays a crucial role in ensuring the overall average milk yield of the herd. Industry practices indicate that the ideal age for heifers to first calve is 22~24 months. Achieving this goal requires heifers to possess excellent reproductive capabilities,and superior reproductive performance ultimately translates into higher milk production,thereby creating greater economic value for the farm.
[1] 乔依娜,吴太平,贺秋月,等. 不同月龄荷斯坦青年母牛初配期繁殖性能和健康状况的研究[J]. 饲料工业,2025(15).
[2] 张吉鹍. 创新奶牛养殖技术转变奶牛经营模式——奶牛规范化饲养管理新技术[J]. 江西畜牧兽医杂志,2014(1):9-16.
[3] Jud H,刘容,孙忠军.我们能提高青年母牛的饲料效率[J].南方奶业,2013(2):2.
[4] Ettema J F, Santos J E P.Impact of age at calving on lactation, reproduction, health, and income in first-parity Holsteins on commercial farms[J].Journal of Dairy Science,2004,87(8):2730-2742.
[5] Boulton A C, Rushton J, Wathes D C.The management and associated costs of rearing heifers on UK dairy farms from weaning to conception[J].Open Journal of Animal Sciences,2015,5(3):294-308.
[6] Silva T V, Lima F S, Thatcher W W, et al.Synchronized ovulation for first insemination improves reproductive performance and reduces cost per pregnancy in dairy heifers[J].Journal of Dairy Science,2015,98(11):7810-7822.
[7] Rabaglino M B, Risco C A, Thatcher M J, et al.Application of one injection of prostaglandin F2α in the five-day Co-Synch+CIDR protocol for estrous synchronization and resynchronization of dairy heifers[J]. Journal of Dairy Science, 2010,93(3):1050-1058.
[8] 杨本顺,叶苗苗,周正海,等.秦川牛发情周期内激素水平的变化以及胎次差异[J].中国牛业科学,2024,50(6):4-8.
[9] Bello N M,Steibel J P,Pursley J R.Optimizing ovulation to first GnRH improved outcomes to each hormonal injection of Ovsynch in lactating dairy cows[J].Journal of Dairy Science,2006,89(9):3413-3424.
[10] 赵明礼,郝海生,马腾,等.青年奶牛同期发情和同期排卵-定时输精试验[J].中国畜牧兽医,2016,43(5):129-134.
[11] Lauber M R,Cabrera E M,Santos V G,et al.Comparison of reproductive management programs for submission of Holstein heifers for first insemination with conventional or sexed semen based on expression of estrus, pregnancy outcomes,and cost per pregnancy[J].Journal of Dairy Science,2021,104(12):12953-12967.
