Carrillo-Muro Octavio, Rivera-Villegas Alejandro, Hernandez-Briano Pedro, Lopez-Carlos Marco Antonio, Plascencia Alejandro
Unidad Académica de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Zacatecas, General Enrique Estrada 98500, Mexico.
Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Sinaloa, Culiacan 80260, Mexico.
Animals (Basel). 2023 Oct 6;13(19):3113. doi: 10.3390/ani13193113.
Forty-five male non-castrated crossbred Dorper lambs (40.17 ± 0.35 kg body weight, BW) were employed in a completely randomized design with five treatments to investigate the effects of the duration of calcium propionate (CaPr) supplementation (10 g CaPr/lamb/d for 0, 14, 28, or 42 d before slaughter) on lambs finished with zilpaterol hydrochloride (ZH, 7.2 mg/lamb/d for a fixed period of 28 d before slaughter) regarding their productive performance, carcass characteristics, and meat quality. Treatments consisted of the following: (1) No additives (CTL), (2) 0 days on CaPr plus 28 d on ZH, (3) 14 days on CaPr plus 28 d on ZH, (4) 28 days on CaPr plus 28 d on ZH, and (5) 42 days on CaPr plus 28 d on ZH. When compared with CTL, ZH lambs exhibited a similar average daily gain (ADG) but had lower dry matter intake (DMI), leading to increased feed efficiency. Supplementing with ZH alone did not affect carcass traits, visceral mass, whole cuts, or meat quality. Lambs that received both CaPr 28 d and ZH exhibited quadratic increases ( < 0.05) in final body weight (FBW), ADG, and dressing percentage (D%). These increases were optimal at estimated inclusion durations of 26 d for FBW, 30 for ADG, and 39 d for D%. The ADG:DMI ratio and the longissimus muscle area (LMA) both exhibited quadratic increases ( < 0.05). The optimal duration of CaPr supplementation for ADG:DMI ratio was found to be 28 d, while for LMA, it was 14 d. As the period of CaPr supplementation increased, there was a linear increase ( < 0.05) in hot carcass weight, leg circumference, and whole cuts of breast IMPS209 and shoulder IMPS207. Cook loss percent increased quadratically ( < 0.05), and was higher when CaPr was included for an estimated duration of 26 d. As the duration of CaPr supplementation increased, the purge loss percentage (PRL) also increased linearly ( < 0.05). In conclusion, including CaPr in the diet for a duration of 28 d in lambs improved the response to ZH supplementation on the productive performance, carcass weight, and some whole cuts. However, it can also have a negative effect on PRL%.
选用45只非去势雄性杂交杜泊羔羊（体重40.17±0.35千克），采用完全随机设计，设置5种处理方式，以研究丙酸钙（CaPr）添加持续时间（屠宰前0、14、28或42天，每只羔羊每天添加10克CaPr）对用盐酸齐帕特罗（ZH，屠宰前固定28天，每只羔羊每天7.2毫克）育肥的羔羊生产性能、胴体特性和肉质的影响。处理方式如下：（1）不添加任何添加剂（CTL）；（2）CaPr添加0天加ZH添加28天；（3）CaPr添加14天加ZH添加28天；（4）CaPr添加28天加ZH添加28天；（5）CaPr添加42天加ZH添加28天。与CTL相比，ZH组羔羊平均日增重（ADG）相似，但干物质采食量（DMI）较低，从而提高了饲料效率。单独添加ZH不影响胴体性状、内脏质量、整切肉或肉质。同时接受28天CaPr和ZH的羔羊，最终体重（FBW）、ADG和屠宰率（D%）呈二次增加（P<0.05）。FBW、ADG和D%的最佳估计添加持续时间分别为26天、30天和39天。ADG:DMI比值和背最长肌面积（LMA）均呈二次增加（P<0.05）。发现ADG:DMI比值的CaPr最佳添加持续时间为28天，而LMA为14天。随着CaPr添加时间的增加，热胴体重、腿围以及胸IMPS209和肩IMPS207的整切肉呈线性增加（P<0.05）。蒸煮损失百分比呈二次增加（P<0.05），当CaPr估计添加持续时间为26天时更高。随着CaPr添加持续时间的增加，渗出损失百分比（PRL）也呈线性增加（P<0.05）。总之，在羔羊日粮中添加28天的CaPr可改善其对ZH添加在生产性能、胴体重和一些整切肉方面的反应。然而，这也可能对PRL%产生负面影响。
